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[scc] Add libcrt to the command line

Libcrt contains symbols that are needed by the other objects,
so it must go at the end of the command line.

--- a/src/cmd/cc/posix/scc.c

+++ b/src/cmd/cc/posix/scc.c

@@ -152,16 +152,6 @@

 				addarg(tool, syscrts[n]);

 			break;

 		}

-		n = snprintf(NULL, 0,

-		             "%s/lib/scc/%s-%s-%s/crt.o",

-		             prefix, arch, abi, sys);

-		if (n < 0)

-			die("scc: wrong crt file name");

-		crt = xmalloc(++n);

-		sprintf(crt,

-		        "%s/lib/scc/%s-%s-%s/crt.o",

-		        prefix, arch, abi, sys);

-		addarg(tool, crt);

 		break;

 	case AS:

 		addarg(tool, "-o");

@@ -613,6 +603,7 @@

 	if (link && !failure) {

 		addarg(LD, xstrdup("-lc"));

+		addarg(LD, xstrdup("-lcrt"));

 		spawn(settool(LD, NULL, LAST_TOOL));

 		validatetools();

 	}