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tests/libc: Enable use of external CC

After this change the invocation of make can modify
the value of CC and select scc or the cc wrapper script.
This can help to test scc using the scc c99 libc.

--- a/tests/libc/execute/Makefile

+++ b/tests/libc/execute/Makefile

@@ -1,19 +1,14 @@

 .POSIX:

-ROOT   = ../../..

-CFLAGS =

-CC     = SCCPREFIX=$(ROOT) ./cc.sh

+CC     = ./cc.sh

 .c:

 	$(CC) $(CFLAGS) -o $@ $<

-all: tests-amd64

+all: tests

-tests-i386:

-	@SCCPREFIX=$(ROOT) CFLAGS='-a i386' ./chktest.sh libc-tests.lst

-

-tests-amd64:

-	@SCCPREFIX=$(ROOT) CFLAGS='-a amd64' ./chktest.sh libc-tests.lst

+tests:

+	@CC=$(CC) ./chktest.sh libc-tests.lst

 clean:

 	rm -f *.o *core test.log `awk '{print $$1}' libc-tests.lst`

--- a/tests/libc/execute/chktest.sh

+++ b/tests/libc/execute/chktest.sh

@@ -13,7 +13,7 @@

 	rm -f *.o $tmp1 $tmp2

 	(echo $i

-	 ./cc.sh $CFLAGS -o $i $i.c

+	 $CC $CFLAGS -o $i $i.c

 	 echo '/^output:$/+;/^end:$/-'w $tmp1 | ed -s $i.c

 	 ./$i > $tmp2 2>&1

 	 diff -u $tmp1 $tmp2) >> test.log 2>&1 &&