[Patch Darwin] adjust crts for Darwin >= 10.

[Iain Sandoe]

The vendor's tools no longer use crts for dylibs or bundles for Darwin  
10.
They also use "crt1.10.6.o" for exes.

our crts amended to match (checked on i686-darwin9 and x86-64-darwin10).
OK for trunk?
Iain

gcc:
	config/darwin.h (STARTFILE_SPEC): Do not use -lbundle1.o when Darwin  
>= 10.
        (DARWIN_DYLIB1_SPEC): Do not use -ldylib1.10.5.o when Darwin >= 10.
        (DARWIN_CRT1_SPEC): Use -lcrt1.10.6.o when Darwin >= 10.

Index: gcc/config/darwin.h
===================================================================
--- gcc/config/darwin.h (revision 181837)
+++ gcc/config/darwin.h (working copy)
@@ -348,7 +348,9 @@ extern GTY(()) int darwin_ms_struct;
 #undef  STARTFILE_SPEC
 #define STARTFILE_SPEC                                                     \
   "%{Zdynamiclib: %(darwin_dylib1) %{fgnu-tm: -lcrttms.o}}                 \
-   %{!Zdynamiclib:%{Zbundle:%{!static:-lbundle1.o %{fgnu-tm: -lcrttms.o}}}  \
+   %{!Zdynamiclib:%{Zbundle:%{!static:                                     \
+       %:version-compare(< 10.6 mmacosx-version-min= -lbundle1.o)          \
+       %{fgnu-tm: -lcrttms.o}}}                                            \
      %{!Zbundle:%{pg:%{static:-lgcrt0.o}                                   \
                      %{!static:%{object:-lgcrt0.o}                         \
                                %{!object:%{preload:-lgcrt0.o}              \
@@ -370,11 +372,12 @@ extern GTY(()) int darwin_ms_struct;
 
 #define DARWIN_DYLIB1_SPEC                                             \
   "%:version-compare(!> 10.5 mmacosx-version-min= -ldylib1.o)          \
-   %:version-compare(>= 10.5 mmacosx-version-min= -ldylib1.10.5.o)"
+   %:version-compare(>< 10.5 10.6 mmacosx-version-min= -ldylib1.10.5.o)"
 
 #define DARWIN_CRT1_SPEC                                               \
   "%:version-compare(!> 10.5 mmacosx-version-min= -lcrt1.o)            \
-   %:version-compare(>= 10.5 mmacosx-version-min= -lcrt1.10.5.o)       \
+   %:version-compare(>< 10.5 10.6 mmacosx-version-min= -lcrt1.10.5.o)  \
+   %:version-compare(>= 10.6 mmacosx-version-min= -lcrt1.10.6.o)       \
    %{fgnu-tm: -lcrttms.o}"
 
 /* Default Darwin ASM_SPEC, very simple.  */