Without the change build fails on `master` as
https://hydra.nixos.org/build/249164637:
In file included from Histogram.cpp:1:
Histogram.h:104:61: error: 'uint32_t' does not name a type
104 | Histogram(const int32_t& start, const int32_t& end, const uint32_t& width);
| ^~~~~~~~
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: ./libfml.a(rle.o):/build/source/SeqLib/fermi-lite/rle.h:33: multiple definition of
`rle_auxtab'; ./libfml.a(misc.o):/build/source/SeqLib/fermi-lite/rle.h:33: first defined here
