Building with clang on amd64 fails with undefined references
to memset and memcpy.  That is odd, since neither function appears
in the source.  Apparently clang optimizes the _dl_memset and
_dl_bcopy functions into calls to memset and memcpy, respectively.

I tentatively propose to add -fno-builtin to fix this.
(Builds, runs, and passes regress with gcc on amd64 and i386.)

Index: Makefile
RCS file: /cvs/src/libexec/,v
retrieving revision 1.62
diff -u -p -r1.62 Makefile
--- Makefile    4 Jul 2016 21:15:06 -0000       1.62
+++ Makefile    22 Dec 2016 16:27:33 -0000
@@ -31,6 +31,7 @@ SRCS+=        library.c
 DEBUG?=        -g
+CFLAGS += -fno-builtin
 CFLAGS += -Wall -Werror
        -D'DEF_WEAK(x)=asm("")' -D'DEF_STRONG(x)=asm("")' \
Christian "naddy" Weisgerber                

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