Update MSYS2 MinGW version to 12.2.0

This is the version actually used for 3.2.2 binaries.

build/tools/mingw/buildall.bat

@@ -11,7 +11,7 @@ rem Initialize the main log file with the current date and time
 echo %date% %time% : wxWidgets-%wxMAJOR_VERSION%.%wxMINOR_VERSION%.%wxRELEASE_NUMBER% build started > %MAINLOGFILE%
 
 rem Loop through all versions of the compiler
-for %%c in ( 730 810 1030 1210 ) do (
+for %%c in ( 730 810 1030 1220 ) do (
     rem For each version, create a 32 and a 64 bits build
     for %%a in ( 32 64 ) do (
         call officialbuild.bat %%c %%a

build/tools/mingw/parameters.bat

@@ -13,7 +13,7 @@ rem Check if architecture is present
 if "%2" == "" goto :NOPARAMS
 
 rem Define compiler's bin directory
-if "%1" == "1210" (
+if "%1" == "1220" (
     set COMPBINDIR=G:\msys64\mingw%2\bin
 ) else (
     set COMPBINDIR=G:\MinGW%1-%2\bin