Bug 1245055 - Remove gfx/skia/Makefile.in. r=mshal

The remains in this file are related to bug 633436. But more than being
apparently obsolete, they are also not used at all, because they don't
appear after including config.mk, which resets CFLAGS and CXXFLAGS
anyways, removing whatever the Makefile set.

gfx/skia/Makefile.in

@@ -1,11 +0,0 @@
-# 
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-ifeq ($(CPU_ARCH)_$(GNU_CC),arm_1)
-# The assembly uses the frame pointer register (r7 in Thumb/r11 in
-# ARM), the compiler doesn't like that.
-CXXFLAGS := $(filter-out -fno-omit-frame-pointer,$(CXXFLAGS)) -fomit-frame-pointer
-CFLAGS := $(filter-out -fno-omit-frame-pointer,$(CFLAGS)) -fomit-frame-pointer
-endif