Fix spec testing on mac with shared build

Since spec test runner now executes the tests in the
directory of the spec test, the default library path
resolution does no longer work with relative paths.

Author: mgreter

script/ci-build-libsass

@@ -128,10 +128,10 @@ then
     echo "Fetching Sass Spec PR $SPEC_PR"
     git -C sass-spec fetch -u origin pull/$SPEC_PR/head:ci-spec-pr-$SPEC_PR
     git -C sass-spec checkout --force ci-spec-pr-$SPEC_PR
-    LD_LIBRARY_PATH="$PREFIX/lib/" make $MAKE_OPTS test_probe
+    make LD_LIBRARY_PATH="$PREFIX/lib/" DYLD_LIBRARY_PATH="$PREFIX/lib/" $MAKE_OPTS test_probe
   else
-    LD_LIBRARY_PATH="$PREFIX/lib/" make $MAKE_OPTS test_probe
+    make LD_LIBRARY_PATH="$PREFIX/lib/" DYLD_LIBRARY_PATH="$PREFIX/lib/" $MAKE_OPTS test_probe
   fi
 else
-  LD_LIBRARY_PATH="$PREFIX/lib/" make $MAKE_OPTS test_probe
+  make LD_LIBRARY_PATH="$PREFIX/lib/" DYLD_LIBRARY_PATH="$PREFIX/lib/" $MAKE_OPTS test_probe
 fi