GCC to 12.4, Newlib to 4.3.0, faster RP2350 libs (#2480)

Newlib built using `-Os` causes things like `memcpy` to be very slow on the
RP2350 because it uses byte-wise operations.  On the RP2040 this doesn't
matter because there is a ROM routine we use instead of the library, but on
the Pico 2 it's almost 10x slower than the optimal method.

Update GCC to 12.4
Update Newlib to 4.4.0
Move to -O2 library compilation

New toolchain looks to add ~10K to RP2350 flash usage (less on the RP2040).

Author: earlephilhower

lib/rp2040/libbearssl.a

@@ -51,7 +51,10 @@ def unpack(filename, destination):
     if filename.endswith('tar.gz'):
         tfile = tarfile.open(filename, 'r:gz')
         os.chdir("../system/")
-        tfile.extractall(destination)
+        try:
+            tfile.extractall(destination, filter='fully_trusted')
+        except TypeError:
+            tfile.extractall(destination)
         dirname= tfile.getnames()[0]
     elif filename.endswith('zip'):
         zfile = zipfile.ZipFile(filename)

lib/rp2040/libipv4-big.a

@@ -11,7 +11,7 @@ install: all version-header
 	cp bearssl/inc/bearssl*.h ../../include/bearssl/.
 
 all2: bearssl/README.txt
-	PATH="$(PWD)/../../system/arm-none-eabi/bin/:$(PATH)" && arm-none-eabi-gcc --version && cd bearssl && $(MAKE) CONF=pico2 all
+	PATH="$(PWD)/../../system/arm-none-eabi/bin/:$(PATH)" && arm-none-eabi-gcc --version && cd bearssl && $(MAKE) CONF=pico2 clean all
 
 install2: all2 version-header
 	cp bearssl/pico/libbearssl.a ../../lib/rp2350/.