COMP: Set DOWNLOAD_EXTRACT_TIMESTAMP to FALSE in wrapping modules

Set `DOWNLOAD_EXTRACT_TIMESTAMP` to `FALSE`: the timestamps of the
extracted files will reflect the time at which the extraction was
performed.

Configure/autoconf based projects like SWIG and PCRE depend on the
timestamps of the extracted files, and the external projects require
setting `DOWNLOAD_EXTRACT_TIMESTAMP` to `FALSE` to build robustly.

Supresses CMake warnings in wrapping modules.

Fixes:
```
CMake Warning (dev) at /usr/local/share/cmake-3.24/Modules/ExternalProject.cmake:3074 (message):
  The DOWNLOAD_EXTRACT_TIMESTAMP option was not given and policy CMP0135 is
  not set.  The policy's OLD behavior will be used.  When using a URL
  download, the timestamps of extracted files should preferably be that of
  the time of extraction, otherwise code that depends on the extracted
  contents might not be rebuilt if the URL changes.  The OLD behavior
  preserves the timestamps from the archive instead, but this is usually not
  what you want.  Update your project to the NEW behavior or specify the
  DOWNLOAD_EXTRACT_TIMESTAMP option with a value of true to avoid this
  robustness issue.
Call Stack (most recent call first):
  /usr/local/share/cmake-3.24/Modules/ExternalProject.cmake:4170 (_ep_add_download_command)
  Wrapping/Generators/SwigInterface/CMakeLists.txt:142 (ExternalProject_Add)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Found BISON: /usr/bin/bison (found version "3.5.1")
CMake Warning (dev) at /usr/local/share/cmake-3.24/Modules/ExternalProject.cmake:3074 (message):
  The DOWNLOAD_EXTRACT_TIMESTAMP option was not given and policy CMP0135 is
  not set.  The policy's OLD behavior will be used.  When using a URL
  download, the timestamps of extracted files should preferably be that of
  the time of extraction, otherwise code that depends on the extracted
  contents might not be rebuilt if the URL changes.  The OLD behavior
  preserves the timestamps from the archive instead, but this is usually not
  what you want.  Update your project to the NEW behavior or specify the
  DOWNLOAD_EXTRACT_TIMESTAMP option with a value of true to avoid this
  robustness issue.
Call Stack (most recent call first):
  /usr/local/share/cmake-3.24/Modules/ExternalProject.cmake:4170 (_ep_add_download_command)
  Wrapping/Generators/SwigInterface/CMakeLists.txt:243 (ExternalProject_Add)
This warning is for project developers.  Use -Wno-dev to suppress it.

CMake Warning (dev) at /usr/local/share/cmake-3.24/Modules/ExternalProject.cmake:3074 (message):
  The DOWNLOAD_EXTRACT_TIMESTAMP option was not given and policy CMP0135 is
  not set.  The policy's OLD behavior will be used.  When using a URL
  download, the timestamps of extracted files should preferably be that of
  the time of extraction, otherwise code that depends on the extracted
  contents might not be rebuilt if the URL changes.  The OLD behavior
  preserves the timestamps from the archive instead, but this is usually not
  what you want.  Update your project to the NEW behavior or specify the
  DOWNLOAD_EXTRACT_TIMESTAMP option with a value of true to avoid this
  robustness issue.
Call Stack (most recent call first):
  /usr/local/share/cmake-3.24/Modules/ExternalProject.cmake:4170 (_ep_add_download_command)
  Wrapping/Generators/CastXML/CMakeLists.txt:63 (ExternalProject_Add)
This warning is for project developers.  Use -Wno-dev to suppress it.
```

raised for example in:
https://open.cdash.org/build/8245525/configure

Related documentation:
https://cmake.org/cmake/help/latest/module/ExternalProject.html?highlight=download_extract_timestamp
https://cmake.org/cmake/help/latest/policy/CMP0135.html

Wrapping/Generators/CastXML/CMakeLists.txt

@@ -66,6 +66,7 @@ else()
       CONFIGURE_COMMAND ""
       BUILD_COMMAND ""
       INSTALL_COMMAND "${CMAKE_COMMAND}" -E copy_directory "${CMAKE_CURRENT_BINARY_DIR}/castxml-prefix/src/castxml" "${CMAKE_CURRENT_BINARY_DIR}/castxml"
+      DOWNLOAD_EXTRACT_TIMESTAMP FALSE
       )
     set(CASTXML_EXECUTABLE ${castxml_ep})
     set(CASTXML_EXECUTABLE ${castxml_ep} CACHE FILEPATH "castxml executable." FORCE)

Wrapping/Generators/SwigInterface/CMakeLists.txt

@@ -148,6 +148,7 @@ else()
           --prefix=${CMAKE_CURRENT_BINARY_DIR}/PCRE
           --enable-shared=no
         ${extra_external_project_commands}
+        DOWNLOAD_EXTRACT_TIMESTAMP FALSE
         )
 
       # swig uses bison find it by cmake and pass it down
@@ -247,6 +248,7 @@ message(STATUS \"Swig configure successfully completed.\")
           ${extra_swig_configure_env} ${CMAKE_COMMAND} -P "${_swig_configure_script}"
         ${extra_external_project_commands}
         DEPENDS PCRE
+        DOWNLOAD_EXTRACT_TIMESTAMP FALSE
         )
     endif()