K 10
svn:author
V 6
kevans
K 8
svn:date
V 27
2020-03-30T00:06:56.613527Z
K 7
svn:log
V 245
bmake: fix -fno-common build

debug was declared extern, but debug_file was not; correct this and define
debug_file in main.c (as debug is) to fix the -fno-common build.

-fno-common will become the default with GCC10/LLVM11.

MFC after:	3 days

END