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[Patch darwin, ppc] lgcc to provide save/restFP for pre-exisitng libraries.

My patch of r163267 breaks powerpc in the case that one has a static lib that refers to save/restFP.
Sorry, I didn't spot that, I bootstrap with gmp/mpfr/mpc in tree ..

I could revert the lgcc change for all archs, but would prefer to try this if that's OK with Mike:

(if it turns out that i686 needs _eprintf for some pre-existing external code, then we might have to give up and just re-add the lgcc for all, which seems a shame)

OK for trunk & 4.5 ? (since this is not a reversion - but an additional patch).

Index: gcc/config/rs6000/darwin.h =================================================================== --- gcc/config/rs6000/darwin.h (revision 163335) +++ gcc/config/rs6000/darwin.h (working copy) @@ -120,6 +120,10 @@ extern int darwin_emit_branch_islands; mcpu=G5:ppc970; \ :ppc}}"

+/* Linked libs might refer to save/restFP - we still need to append - lgcc to
+ provide these. */
+#define LIB_SPEC "%{!static:-lgcc -lSystem}"
/* crt2.o is at least partially required for 10.3.x and earlier. */
#define DARWIN_CRT2_SPEC \
"%{!m64:%:version-compare(!> 10.4 mmacosx-version-min= crt2.o%s)}"

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