Fix groff build with libc++ 9.0.0
Because libc++ 9.0.0 now includes <math.h> from <stdlib.h>, groff fails
to build with an error similar to:
In file included from src/libs/libgroff/assert.cpp:20:
In file included from /usr/include/c++/v1/stdlib.h💯
./lib/math.h:38:3: error: "Please include config.h first."
#error "Please include config.h first."
^
./lib/math.h:40:1: error: unknown type name '_GL_INLINE_HEADER_BEGIN'
_GL_INLINE_HEADER_BEGIN
^
Fix this in the least intrusive way, by simply including config.h
instead of emitting an error message.
Approved by: portmgr (joneum)
PR: 240701
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