Darwin, ppc: Add system stubs for all 32b PPC

This is a minor adjustment to make the GCC behaviour better match the
old system tools.

Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>

gcc/ChangeLog:

	* config/rs6000/darwin.h (LIB_SPEC): Include libSystemStubs for
	all 32b Darwin PowerPC cases.

gcc/config/rs6000/darwin.h

@@ -98,7 +98,7 @@
    Include libmx when targeting Darwin 7.0 and above, but before libSystem,
    since the functions are actually in libSystem but for 7.x compatibility
    we want them to be looked for in libmx first.
-   Include libSystemStubs when compiling against 10.3 - 10.5 SDKs (we assume
+   Include libSystemStubs when compiling against 10.3 - 10.6 SDKs (we assume
    this is the case when targetting these) - but not for 64-bit long double.
    Don't do either for m64, the library is either a dummy or non-existent.
 */
@@ -107,8 +107,8 @@
 #define LIB_SPEC \
 "%{!static:								\
   %{!m64:%{!mlong-double-64:						\
-    %{pg:%:version-compare(>< 10.3 10.5 mmacosx-version-min= -lSystemStubs_profile)} \
-    %{!pg:%:version-compare(>< 10.3 10.5 mmacosx-version-min= -lSystemStubs)} \
+    %{pg:%:version-compare(>< 10.3 10.7 mmacosx-version-min= -lSystemStubs_profile)} \
+    %{!pg:%:version-compare(>< 10.3 10.7 mmacosx-version-min= -lSystemStubs)} \
      %:version-compare(>< 10.3 10.4 mmacosx-version-min= -lmx)}}	\
   -lSystem								\
 }"