powerpc: fix global destructors (fix #40)

gcc/libgcc/config.host

@@ -1123,7 +1123,7 @@ rs6000-ibm-aix[56789].* | powerpc-ibm-aix[56789].*)
 	extra_parts="crtcxa.o crtcxa_s.o crtdbase.o"
 	;;
 powerpc-*-macos)
-	tmake_file="t-fdpbit rs6000/t-ibm-ldouble rs6000/t-aix-cxa"
+	tmake_file="t-fdpbit rs6000/t-ibm-ldouble"
 	;;
 rl78-*-elf)
 	tmake_file="$tm_file t-fdpbit rl78/t-rl78"

libretro/ppcstart.c

@@ -28,9 +28,13 @@
 
 int main(int argc, char* argv[]);
 
+void __do_global_dtors();
+
 void __start()
 {
 	int result;
+
+	atexit(&__do_global_dtors);
 	{
 		char *argv[2] = { "./a.out", NULL };
 		result = main(1, argv);