with structuredAttrs lists will be bash arrays which cannot be exported
which will be a issue with some patches and some wrappers like cc-wrapper
this makes it clearer that NIX_CFLAGS_COMPILE must be a string as lists
in env cause a eval failure
Workaround build failure on -fno-common toolchains like upstream
gcc-10. Otherwise build fails as:
ld: ../readelf-mini/libreadelf-mini.a(dwarf.o):/build/source/readelf-mini/dwarf.c:64:
multiple definition of `do_wide'; ../readelf-mini/libreadelf-mini.a(readelf-mini.o):/build/source/readelf-mini/readelf-mini.c:170: first defined here