avoid regression on sparc-user and ppc-user

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2203 c046a42c-6fe2-441c-8c8c-71466251a162

Makefile.target

@@ -494,6 +494,11 @@ endif
 cpu-exec.o: cpu-exec.c
 	$(CC) $(HELPER_CFLAGS) $(DEFINES) -c -o $@ $<
 
+# Note: this is a workaround. The real fix is to avoid compiling
+# cpu_signal_handler() in cpu-exec.c.
+signal.o: signal.c
+	$(CC) $(HELPER_CFLAGS) $(DEFINES) -c -o $@ $<
+
 ifeq ($(TARGET_BASE_ARCH), i386)
 op.o: op.c opreg_template.h ops_template.h ops_template_mem.h ops_mem.h ops_sse.h
 endif