Added script for compiling MINGW32 cmake based ports

[AKuHAK]

Fix zlib to always use libz.a instead of libzlib.a

[AKuHAK]

@ps2dev Commit f10cd50 is not the best solution that I found, but I didn't found a solution on how to use if-else statements inside the bash function. MINGW32 CMake-based projects need to use mingw32-make instead of make and don't support multithreading. And CMake needs -G "MinGW Makefiles" flag. so I just created an alternative bash script for that purpose. If someone knows how to improve this solution, you can fix my PR.

Also romfs port doesn't compile in MINGW32.

[rickgaiser]

Instead of using make and mingw32-make isn't it possible to use $(MAKE) instead? Optional parameters are also used in other scripts, for instance something like this:

if [ ${OSVER:0:5} == MINGW ]; then
    XTRA_OPTS=-G "MinGW Makefiles"
fi

I would prefer to keep this all in one script, since they are 90% the same.

[AKuHAK]

@rickgaiser yes $(MAKE) will solve the problem, but I was not able to get it to work. If I check OSVER and define MAKE=mingw32-make this just doesn't work. for unknown reason if-else didn't work in this bash script - I didn't found the reason why.

    XTRA_OPTS=-G "MinGW Makefiles"

this also will not work - when I define variable in such way, everything after space character is cut off: it will be like -G "MinGW and produces an error.

[AKuHAK]

@rickgaiser with some tricky solutions, now it is working fine in all compatible environments. For now it is only needed to fix romfs and this PR can be merged.

[AKuHAK]

Everything is fixed, hope can be merged now. Will check multicore again

[rickgaiser]

If you're ready I'll pull the PR?

[fjtrujy]

I see it ready as well. You can merge @rickgaiser if @AKuHAK says it is ok. Thanks

[AKuHAK]

Yes, it is ok now, you can merge it, it is supporting multicore.

[rickgaiser]

Merged, thanks for supporting Windows @AKuHAK !