adds libmsvcrt from mingw-64 to the build directory

[ajinkya-k]

The Problem: Build fails on Windows when using Msys/MinGW

Build was failing on windows 11 with MINGW64 using these instructions with the following error (See #57397). This is perhaps because of C runtime version mismatches (see #56840).

Output ────── 450.762215 seconds
    LINK usr/lib/julia/sys.dll
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../lib/dllcrt2.o: in function `_CRT_INIT':
C:/M/B/src/mingw-w64/mingw-w64-crt/crt/crtdll.c:100:(.text+0x15d): undefined reference to `_initterm_e'
collect2.exe: error: ld returned 1 exit status
make[1]: *** [sysimage.mk:18: /c/Users/kajin/Documents/julia/usr/lib/julia/sys.dll] Error 1
make: *** [Makefile:120: julia-sysimg-release] Error 2

The fix

Copy the libmsvcrt.a provided by mingw in the right spot in the julia build directory.

this PR fixes it
based on this patch:

https://github.com/Zentrik/llvm_julia_tester/blob/d8bfc7590bbcb3a9bc5c9eedbfe11bf65eddd91c/julia-patches/ffba662dd275d1bdd5a5935f4d3cc372b5235d07

Fix #56840, fix #57397.

[ajinkya-k]

This seems to have fixed the build. I am not sure if this is a temporary fix or works more generally. Could the maintainers take a look and suggest changes (if any)?

[giordano]

This seems to have fixed the build

Can you elaborate what was the issue in the first place?

[ajinkya-k]

Building from source was failing on windows using mingw64. This is due to a mismatch of the c runtime library being used to link against. The error is reported in #57397 and done relevant discussion in #56840

[ajinkya-k]

@giordano I removed the hardcoded paths, and using MINGW_PREFIX environment variable instead.

[ajinkya-k]

okay the newest change might have broken the mingw32 we might need the if statement after all.

[ajinkya-k]

This does fix the build for 64bit but fails on mingw32 🥲

[ajinkya-k]

@giordano Is using $(MINGW_PREFIX) in the makefiles okay?

[giordano]

Don't ask me, I don't use Windows, I have no clue 🙂 at least it's an environment variable which can be overridden.

[ajinkya-k]

Maybe @vtjnash might know?

[vtjnash]

We have the same line a couple lines higher, so this may just corrupt the build, depending on the compiler version in use. I am not sure the most reasonable fix here, since I've also run into those issues and use a similar patch to get around them