`autoconf-2.72` tweaked `AC_CHECK_LIB` macro a bit and exposed missing
quoting in `configure.in` of `0verkill` as:
0verkill-unstable> ./configure: line 4182: syntax error near unexpected token `newline'
0verkill-unstable> ./configure: line 4182: `yes:'
`configure.in` requires a bit of patching. Let's pin it to older `2.69`
to allow `autoconf` upgrade to 2.72.
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
Without the change the build against upstream gcc-10 build fails as:
ld: sprite.o:/build/0verkill/data.h:171: multiple definition of `obj_attr'; server.o:/build/0verkill/data.h:171: first defined here
ld: sprite.o:/build/0verkill/data.h:142: multiple definition of `weapon_name'; server.o:/build/0verkill/data.h:142: first defined here
Use -fcommon as a workeround until upstream updates the code.
