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: libupnp/upnp/.libs/libupnp.a(libupnp_la-gena_ctrlpt.o):libupnp/upnp/src/inc/upnpapi.h:163:
multiple definition of `pVirtualDirList'; libupnp/upnp/.libs/libupnp.a(libupnp_la-upnpapi.o):libupnp/upnp/src/inc/upnpapi.h:163: first defined here