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make test: command errors on Windows

See original GitHub issue

https://github.com/eerimoq/cantools/blob/34fb50c3e45312279e2e928fc68da890d8ace6f8/Makefile#L151 When running make test on WIndows, this seems to produce malformed gcc calls.

make test-c-src
make[2]: Entering directory '/c/backup/cantools'
for f in tests/files/c_source/motohawk.c tests/files/c_source/padding_bit_order.c tests/files/c_source/vehicle.c tests/files/c_source/multiplex.c tests/files/c_source/multiplex_2.c tests/files/c_source/floating_point.c tests/files/c_source/no_signals.c tests/files/c_source/choices.c tests/files/c_source/signed.c tests/files/c_source/my_database_name.c tests/files/c_source/min_max_only_6_0.c tests/files/c_source/abs.c ; do \
    C:\msys64\mingw64\bin\gcc.exe -Wall -Wextra -Wdouble-promotion -Wfloat-equal -Wformat=2 -Wshadow -Werror -Wconversion -Wpedantic -std=c99 -O3 -c $f ; \
done
/bin/sh: line 1: C:msys64mingw64bingcc.exe: command not found
/bin/sh: line 1: C:msys64mingw64bingcc.exe: command not found
/bin/sh: line 1: C:msys64mingw64bingcc.exe: command not found
/bin/sh: line 1: C:msys64mingw64bingcc.exe: command not found
/bin/sh: line 1: C:msys64mingw64bingcc.exe: command not found
/bin/sh: line 1: C:msys64mingw64bingcc.exe: command not found
/bin/sh: line 1: C:msys64mingw64bingcc.exe: command not found
/bin/sh: line 1: C:msys64mingw64bingcc.exe: command not found
/bin/sh: line 1: C:msys64mingw64bingcc.exe: command not found
/bin/sh: line 1: C:msys64mingw64bingcc.exe: command not found
/bin/sh: line 1: C:msys64mingw64bingcc.exe: command not found
/bin/sh: line 1: C:msys64mingw64bingcc.exe: command not found
make[2]: *** [Makefile:151: test-c-src] Error 127
make[2]: Leaving directory '/c/backup/cantools'
make[1]: *** [Makefile:160: test-c] Error 2
make[1]: Leaving directory '/c/backup/cantools'
make: *** [Makefile:147: test] Error 2

C:\backup\cantools>

There is something wrong with the slashes.