Bug#1086599: gccmakedep.1: Some remarks and editorial changes for this man page

[Alan Coopersmith]

Control: tags 1086599 fixed-upstream

https://gitlab.freedesktop.org/xorg/util/gccmakedep/-/commit/b5a32e2925397886ef28fbe567254a5cd0a2f99c

--
        -Alan Coopersmith-                 alan.coopersm...@oracle.com
         Oracle Solaris Engineering - https://blogs.oracle.com/solaris