GN: Fix extra escaping of rpath=$ORIGIN/lib ldflag

As written the argument ended up in the .ninja file as \\\$$ORIGIN/lib/
but we want \$$ORIGIN/lib/ to match gyp.

R=brettw@chromium.org

Review URL: https://codereview.chromium.org/409883009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284888 0039d316-1c4b-4281-b951-d872f2087c98

build/config/gcc/BUILD.gn

@@ -21,9 +21,8 @@ config("symbol_visibility_hidden") {
 # Settings for executables and shared libraries.
 config("executable_ldconfig") {
   ldflags = [
-    # Want to pass "\$". Need to escape both '\' and '$'. GN will re-escape as
-    # required for ninja.
-    "-Wl,-rpath=\\\$ORIGIN/lib/",
+    # Want to pass "\$". GN will re-escape as required for ninja.
+    "-Wl,-rpath=\$ORIGIN/lib/",
 
     "-Wl,-rpath-link=lib/",
   ]