Re-enable the autoconf test that fixes the nsCOMPtr operator== ambiguities on Linux and HP now that we know it works correctly on HP. b=65664 r=scc@mozilla.org sr=brendan@mozilla.org

configure.in

@@ -3432,9 +3432,9 @@ AC_CACHE_CHECK(for bug where toplevel cv-qualifiers are used in overload resolut
 AC_LANG_C
 CXXFLAGS="$_SAVE_CXXFLAGS"
 
-dnl if test "$ac_cv_quals_ambig_bug" = "yes" ; then
-dnl     AC_DEFINE(CPP_CV_QUALIFIERS_CAUSE_AMBIGUITY)
-dnl fi
+if test "$ac_cv_quals_ambig_bug" = "yes" ; then
+    AC_DEFINE(CPP_CV_QUALIFIERS_CAUSE_AMBIGUITY)
+fi
 
 dnl pass -Wno-long-long to the compiler
 MOZ_ARG_ENABLE_BOOL(long-long-warning,