shithub: scc

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Add __SCC__ macro

This macro communicates to the source file being compiled
that scc is compiling it.

--- a/cc1/cpp.c

+++ b/cc1/cpp.c

@@ -47,6 +47,7 @@

 	strftime(stime, sizeof(stime), "-1#\"%H:%M:%S\"", tm);

 	defmacro("__STDC__")->u.s = "-1#1";

+	defmacro("__SCC__")->u.s = "-1#1";

 	defmacro("__DATE__")->u.s = sdate;

 	defmacro("__TIME__")->u.s = stime;

 	defmacro("__STDC_HOSTED__")->u.s = "-1#1";