$NetBSD: patch-libgcc_config_t-slibgcc-darwin,v 1.1 2014/09/04 18:43:11 jperkin Exp $

If we don't install libgcc_s.10.[45].dylib, our gcc links binaries
with *both* /usr/lib/libgcc_s.1.dylib and
${GCC_PREFIX}/lib/libgcc_s.1.dylib, which is certainly a bad thing.

The problem was already reported to the upstream but it caught
seemingly no attention:
http://gcc.gnu.org/ml/gcc-help/2010-07/msg00164.html

--- libgcc/config/t-slibgcc-darwin.orig	2011-11-02 10:49:46.000000000 +0000
+++ libgcc/config/t-slibgcc-darwin
@@ -27,13 +27,7 @@ SHLIB_MKMAP_OPTS = -v leading_underscore
 SHLIB_MAPFILES = libgcc-std.ver $(srcdir)/config/libgcc-libsystem.ver
 SHLIB_VERPFX = $(srcdir)/config/$(cpu_type)/libgcc-darwin
 
-# we're only going to build the stubs if the target slib is /usr/lib
-# there is no other case in which they're useful in a live system.
-ifeq (/usr/lib,$(shlib_slibdir))
 LGCC_STUBS = libgcc_s.10.4.dylib libgcc_s.10.5.dylib
-else
-LGCC_STUBS =
-endif
 
 LGCC_FILES = libgcc_s.$(SHLIB_SOVERSION)$(SHLIB_EXT)
 LGCC_FILES += $(LGCC_STUBS)