sh: fix build for SH in !NPTL case

Signed-off-by: Rob Landley <rob@landley.net>
Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>

libc/sysdeps/linux/sh/Makefile.arch

@@ -9,4 +9,4 @@
 CSRC := \
 	mmap.c pipe.c __init_brk.c brk.c sbrk.c pread_write.c cacheflush.c
 
-SSRC := setjmp.S __longjmp.S ___fpscr_values.S vfork.S
+SSRC := setjmp.S __longjmp.S ___fpscr_values.S vfork.S clone.S