sparc/clone.S: guard tcb-offsets.h include with RESET_PID

Otherwise we have a broken scenario with non-threading builds.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

libc/sysdeps/linux/sparc/clone.S

@@ -22,7 +22,9 @@
 
 #include <asm/errno.h>
 #include <asm/unistd.h>
+#ifdef RESET_PID
 #include <tcb-offsets.h>
+#endif
 #include <sysdep.h>
 
 #define CLONE_VM	0x00000100