android: build libGLES_mesa

This is the first step to integrate Mesa into Android(-x86) build
system.  You can git clone mesa under the external/ directory of Android
source tree and build Android with

 $ make BOARD_GPU_DRIVERS=swrast

It will build libGLES_mesa that will be loaded by Android runtime.

libGLES_mesa is still a stub in this commit.

Android.common.mk

@@ -0,0 +1,48 @@
+# Mesa 3-D graphics library
+#
+# Copyright (C) 2010-2011 Chia-I Wu <olvaffe@gmail.com>
+# Copyright (C) 2010-2011 LunarG Inc.
+#
+# Permission is hereby granted, free of charge, to any person obtaining a
+# copy of this software and associated documentation files (the "Software"),
+# to deal in the Software without restriction, including without limitation
+# the rights to use, copy, modify, merge, publish, distribute, sublicense,
+# and/or sell copies of the Software, and to permit persons to whom the
+# Software is furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+# DEALINGS IN THE SOFTWARE.
+
+LOCAL_C_INCLUDES += \
+	$(MESA_TOP)/include
+
+LOCAL_CFLAGS += \
+	-DPTHREADS \
+	-fvisibility=hidden \
+	-Wno-sign-compare
+
+ifeq ($(strip $(MESA_ENABLE_ASM)),true)
+ifeq ($(TARGET_ARCH),x86)
+LOCAL_CFLAGS += \
+	-DUSE_X86_ASM
+endif
+endif
+
+LOCAL_CPPFLAGS += \
+	-Wno-error=non-virtual-dtor \
+	-Wno-non-virtual-dtor
+
+# uncomment to keep the debug symbols
+#LOCAL_STRIP_MODULE := false
+
+ifeq ($(strip $(LOCAL_MODULE_TAGS)),)
+LOCAL_MODULE_TAGS := optional
+endif