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driver/posix: Add support for crt begin and crt end

Some systems need a set of crt files to be added at the beginning
of the link stage and other set at the end. Currently scc only
supported a set of crts files at the beginning of the link
stage.

--- a/include/scc/scc/syscrts.def.h

+++ b/include/scc/scc/syscrts.def.h

@@ -1,5 +1,9 @@

 /* configure below your system crts */

-char *syscrts[] = {

+char *syscrtsb[] = {

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

+	NULL

+};

+

+char *syscrtse[] = {

 	NULL

 };

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

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

@@ -201,8 +201,8 @@

 			addarg(tool, "-L");

 			addarg(tool, path(syslibs[n]));

 		}

-		for (n = 0; syscrts[n]; ++n)

-			addarg(tool, path(syscrts[n]));

+		for (n = 0; syscrtsb[n]; ++n)

+			addarg(tool, path(syscrtsb[n]));

 		break;

 	case AS:

 		addarg(tool, "-o");

@@ -525,7 +525,7 @@

 main(int argc, char *argv[])

 {

 	struct items linkchain = { .n = 0, };

-	int link;

+	int link, n;

 	atexit(terminate);

@@ -652,6 +652,8 @@

 	if (link && !failure) {

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

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

+		for (n = 0; syscrtse[n]; ++n)

+			addarg(LD, path(syscrtse[n]));

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

 		validatetools();

 	}