Re: Branch scratch/correct-warning-pos now bootstraps with or without native compilation.

[Eli Zaretskii]

> From: Brahimi Saifullah <brahimi.saifullah@gmail.com>
> Date: Thu, 30 Dec 2021 18:09:07 -0300
> Cc: Andrea Corallo <akrl@sdf.org>, Stefan Monnier <monnier@iro.umontreal.ca>,
>  emacs-devel@gnu.org
> 
>   CCLD     temacs.exe
> C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/11.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe:
>  comp.o: in function `emit_SYMBOL_WITH_POS_SYM':
> C:\emacs\2912\src/comp.c:1487: undefined reference to 
> `gcc_jit_context_new_location'
> C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/11.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe:
>  comp.o: in function `emit_EQ':
> C:\emacs\2912\src/comp.c:1499: undefined reference to 
> `gcc_jit_context_new_location'
> C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/11.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe:
>  C:\emacs\2912\src/comp.c:1499: undefined reference to 
> `gcc_jit_context_new_location'
> collect2.exe: error: ld returned 1 exit status
> make[1]: *** [Makefile:691: temacs.exe] Error 1
> make[1]: Leaving directory '/c/emacs/2912/src'
> make: *** [Makefile:452: src] Error 2

This function was not used previously in Emacs, so it should be added
to the boilerplate code under WINDOWSNT at the beginning of comp.c,
because the Windows build will load the function dynamically at run
time.