Fix build of gccgo-wrapper on Illumos.

When compiling GCC with NIX_ENFORCE_PURITY,
linking libgcc fails because crti.o and friends
aren't part of the nix store.

pkgs/build-support/gcc-wrapper-old/utils.sh

@@ -14,6 +14,8 @@ badPath() {
     # the temporary build directory).
     if test "${p:0:1}" != "/"; then return 1; fi
     
+    @extraPathTests@
+
     # Otherwise, the path should refer to the store or some temporary
     # directory (including the build directory).
     test \

pkgs/development/compilers/gcc/4.8/default.nix

@@ -294,7 +294,6 @@ stdenv.mkDerivation ({
     ++ (optional stdenv.isDarwin gnused)
     ;
 
-  NIX_LDFLAGS = stdenv.lib.optionalString  stdenv.isSunOS "-lm -ldl";
 
   preConfigure = stdenv.lib.optionalString (stdenv.isSunOS && stdenv.is64bit) ''
     export NIX_LDFLAGS=`echo $NIX_LDFLAGS | sed -e s~$prefix/lib~$prefix/lib/amd64~g`

pkgs/top-level/all-packages.nix

@@ -16,6 +16,7 @@
   # outside of the store.  Thus, GCC, GFortran, & co. must always look for
   # files in standard system directories (/usr/include, etc.)
   noSysDirs ? (system != "x86_64-freebsd" && system != "i686-freebsd"
+               && system != "x86_64-solaris"
                && system != "x86_64-kfreebsd-gnu")
 
   # More flags for the bootstrapping of stdenv.