libgcc, aarch64, Darwin: Do not build legacy EH shim.

Darwin aarch64 does not exist for macOS 10.6, so there is no need to
build a shim to target it.

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

libgcc/

	* config.host: Omit the Darwin10 unwinder shim for aarch64 Darwin.

libgcc/config.host

@@ -264,7 +264,7 @@ case ${host} in
       echo "Warning: libgcc configured to support macOS 10.5" 1>&2
       ;;
   esac
-  extra_parts="crt3.o libd10-uwfef.a crttms.o crttme.o libemutls_w.a"
+  extra_parts="crt3.o crttms.o crttme.o libemutls_w.a"
   ;;
 *-*-dragonfly*)
   tmake_file="$tmake_file t-crtstuff-pic t-libgcc-pic t-eh-dw2-dip"
@@ -735,11 +735,13 @@ hppa*-*-netbsd*)
 i[34567]86-*-darwin*)
 	tmake_file="$tmake_file i386/t-crtpc t-crtfm i386/t-msabi"
 	tm_file="$tm_file i386/darwin-lib.h"
+	extra_parts="$extra_parts libd10-uwfef.a "
 	extra_parts="$extra_parts crtprec32.o crtprec64.o crtprec80.o crtfastmath.o"
 	;;
 x86_64-*-darwin*)
 	tmake_file="$tmake_file i386/t-crtpc t-crtfm i386/t-msabi"
 	tm_file="$tm_file i386/darwin-lib.h"
+	extra_parts="$extra_parts libd10-uwfef.a "
 	extra_parts="$extra_parts crtprec32.o crtprec64.o crtprec80.o crtfastmath.o"
 	if test x$off_stack_trampolines = xyes; then
 	    tmake_file="${tmake_file} i386/t-heap-trampoline"
@@ -1199,12 +1201,14 @@ powerpc-*-darwin*)
 	# We build the darwin10 EH shim for Rosetta (running on x86 machines).
 	tm_file="$tm_file i386/darwin-lib.h"
 	tmake_file="$tmake_file rs6000/t-ppc64-fp rs6000/t-ibm-ldouble"
+	extra_parts="$extra_parts libd10-uwfef.a "
 	extra_parts="$extra_parts crt2.o crt3_2.o libef_ppc.a dw_ppc.o"
 	;;
 powerpc64-*-darwin*)
 	# We build the darwin10 EH shim for Rosetta (running on x86 machines).
 	tm_file="$tm_file i386/darwin-lib.h"
 	tmake_file="$tmake_file rs6000/t-darwin64 rs6000/t-ibm-ldouble"
+	extra_parts="$extra_parts libd10-uwfef.a "
 	extra_parts="$extra_parts crt2.o crt3_2.o libef_ppc.a dw_ppc.o"
 	;;
 powerpc*-*-freebsd*)