configure: fix compilation --with-openmp in MS Windows

[hellik]

fix #2885 by adapting package.sh

[hellik]

anyone able to backport it then when PR is merged?

[nilason]

Looks good to me!

[neteler]

Great to see these improvements!

(would you mind to make the pull request title compliant with our release notes style? Then notes autogeneration will work much better)

[landam]

Tested on build server:

x86_64-w64-mingw32-gcc -shared -o /usr/src/grass83/dist.x86_64-w64-mingw32/lib/libgrass_interpfl.8.3.dll -L/usr/src/grass83/dist.x86_64-w64-mingw32/lib -L/usr/src/grass83/dist.x86_64-w64-mingw32/lib -Wl,--export-dynamic,--enable-runtime-pseudo-reloc  -L/c/osgeo4w/lib   OBJ.x86_64-w64-mingw32/distance.o OBJ.x86_64-w64-mingw32/func2d.o OBJ.x86_64-w64-mingw32/init2d.o OBJ.x86_64-w64-mingw32/input2d.o OBJ.x86_64-w64-mingw32/interp2d.o OBJ.x86_64-w64-mingw32/matrix.o OBJ.x86_64-w64-mingw32/minmax.o OBJ.x86_64-w64-mingw32/output2d.o OBJ.x86_64-w64-mingw32/point2d.o OBJ.x86_64-w64-mingw32/resout2d.o OBJ.x86_64-w64-mingw32/ressegm2d.o OBJ.x86_64-w64-mingw32/secpar2d.o OBJ.x86_64-w64-mingw32/segmen2d.o OBJ.x86_64-w64-mingw32/segmen2d_parallel.o OBJ.x86_64-w64-mingw32/vinput2d.o OBJ.x86_64-w64-mingw32/write2d.o -lgrass_gis.8.3 -lintl -lgrass_raster.8.3 -lgrass_vector.8.3 -lgrass_gmath.8.3 -lgrass_dbmiclient.8.3 -lgrass_dbmibase.8.3  -lgrass_bitmap.8.3 -lgrass_qtree.8.3 -lgrass_interpdata.8.3   -lgomp  
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: warning: --export-dynamic is not supported for PE+ targets, did you mean --export-all-symbols?
if [ "" != "" -a -f "".html ] ; then make html ; fi
make[5]: Leaving directory '/usr/src/grass83/lib/rst/interp_float'

I am taking liberty to merge it.

[landam]

@hellik Is backport really needed? GRASS82 seems to be compiled successfully: https://wingrass.fsv.cvut.cz/grass82/logs/log-r1e2ac5a211-207/error.log

[hellik]

@hellik Is backport really needed? GRASS82 seems to be compiled successfully: https://wingrass.fsv.cvut.cz/grass82/logs/log-r1e2ac5a211-207/error.log

See #2885 (comment)

It depends If the PR mentioned in this comment will be backported or not.

See also in the thread that the msys2 environment has to be adapted accordingly to avoid gcc/clang clash.

I'll merge later in the evening.

[landam]

I'll merge later in the evening.

OK.

[hellik]

I'll merge later in the evening.

OK.

done.

@landam @nilason @neteler still open is discussion if #2692 will be applied to 8.2. if yes, then this PR has to be backported.