Add x86_64-darwin11-gcc target.

This allows building on MountainLion as the 10.6 SDK has been
removed from the latest Xcode version (4.4 4F250). Also fix
all warnings for that build.

Change-Id: Ib70bca4a25295f13595f0d10ea9f0229631de5a4

build/make/configure.sh

@@ -623,6 +623,12 @@ process_common_toolchain() {
             add_ldflags "-isysroot /Developer/SDKs/MacOSX10.6.sdk"
             add_ldflags "-mmacosx-version-min=10.6"
             ;;
+        *-darwin11-*)
+            add_cflags  "-isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.7.sdk"
+            add_cflags  "-mmacosx-version-min=10.7"
+            add_ldflags "-isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.7.sdk"
+            add_ldflags "-mmacosx-version-min=10.7"
+            ;;
     esac
 
     # Handle Solaris variants. Solaris 10 needs -lposix4

build/make/gen_asm_deps.sh

@@ -42,7 +42,7 @@ done
 
 [ -n "$srcfile" ] || show_help
 sfx=${sfx:-asm}
-includes=$(egrep -i "include +\"?+[a-z0-9_/]+\.${sfx}" $srcfile |
+includes=$(egrep -i "include +\"?[a-z0-9_/]+\.${sfx}" $srcfile |
            perl -p -e "s;.*?([a-z0-9_/]+.${sfx}).*;\1;")
 #" restore editor state
 for inc in ${includes}; do