If --disable-md is given, do not use gcc's -include directive as it screws up dependencies.

Bug 140171 r=bryner

configure.in

@@ -3965,7 +3965,7 @@ dnl ========================================================
 _cpp_md_flag=
 MOZ_ARG_DISABLE_BOOL(md,
 [  --disable-md            Do not use compiler-based dependencies ],
-  [],
+  [_cpp_md_flag=],
   [_cpp_md_flag=1],
   [dnl Default is to turn on -MD if using GNU-compatible compilers
    if test "$GNU_CC" -a "$GNU_CXX"; then
@@ -3974,6 +3974,11 @@ MOZ_ARG_DISABLE_BOOL(md,
 if test "$_cpp_md_flag"; then
   COMPILER_DEPEND=1
   _DEPEND_CFLAGS='$(filter-out %/.pp,-Wp,-MD,$(MDDEPDIR)/$(*F).pp)'
+else
+  COMPILER_DEPEND=
+  _USE_CPP_INCLUDE_FLAG=
+  _DEFINES_CFLAGS='$(ACDEFINES) -DMOZILLA_CLIENT'
+  _DEFINES_CXXFLAGS='$(ACDEFINES) -DMOZILLA_CLIENT'
 fi
 fi # MOZ_AUTO_DEPS
 MDDEPDIR='.deps'