[icu] Fix configure failure due to not finding python

[LilyWangL]

Describe the pull request
Fix configure failure due to not finding python.

• What does your PR fix? Fixes issue [ICU] Configure failure due to not finding python #10642

• No features need to test.

[MVoz]

maybe it’s worth adding it here

vcpkg/scripts/cmake/vcpkg_find_acquire_program.cmake

Line 127 in e1fc03c

set(POST_INSTALL_COMMAND ${CMAKE_COMMAND} -E remove python37._pth)

      set(POST_INSTALL_COMMAND ${CMAKE_COMMAND} -E remove python37._pth)
      find_program(PYTHON_EXECUTABLE NAMES python python3 python3.7 HINTS ${PATHS}  NO_DEFAULT_PATH)
        vcpkg_add_to_path(PREPEND ${PATHS})
      mark_as_advanced(PYTHON_EXECUTABLE)

and only specify this in the port files

vcpkg_find_acquire_program(PYTHON3)

[Neumann-A]

vcpkg_find_acquire_program should have options to append (APPEND_TO_PATH) or prepend (PREPEND_TO_PATH) to path automatically but that is a completely different issue

[ras0219-msft]

LGTM. Thanks @LilyWangL, @NancyLi1013, and @Neumann-A!