Compile libmraa for Android and Brillo

Add makefile for building libmraa library.

Import glob functionality from the NetBSD project where the glob.c and
glob.h files are released under BSD 3-clause License. Minor changes were
applied in order to make them compile for Android and Brillo.

This patch adds a control pipe used to interrupt the poll() function
as an alternative to pthread cancellation API.

Change-Id: Id719da4c839acbd320b0cc0e0113c2a5239c8029
Signed-off-by: Mihai Serban <mihai.serban@intel.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

Android.mk

@@ -0,0 +1,57 @@
+# Copyright (C) 2015 Intel Corporation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := libmraa
+LOCAL_CFLAGS += -Wno-unused-parameter -DX86PLAT=1
+LOCAL_SHARED_LIBRARIES := libcutils libutils libdl libc
+LOCAL_SRC_FILES := \
+    src/mraa.c \
+    src/gpio/gpio.c \
+    src/i2c/i2c.c \
+    src/pwm/pwm.c \
+    src/spi/spi.c \
+    src/aio/aio.c \
+    src/uart/uart.c \
+    src/x86/x86.c \
+    src/x86/intel_galileo_rev_d.c \
+    src/x86/intel_galileo_rev_g.c \
+    src/x86/intel_edison_fab_c.c  \
+    src/x86/intel_de3815.c \
+    src/x86/intel_nuc5.c \
+    src/x86/intel_minnow_byt_compatible.c
+
+# glob.c pulled in from NetBSD project (BSD 3-clause License)
+LOCAL_SRC_FILES += \
+    src/glob/glob.c
+
+LOCAL_C_INCLUDES := \
+    $(LOCAL_PATH)/include \
+    $(LOCAL_PATH)/include/linux \
+    $(LOCAL_PATH)/include/x86 \
+    $(LOCAL_PATH)/api \
+    $(LOCAL_PATH)/api/mraa \
+    $(LOCAL_PATH)/src/glob
+
+LOCAL_EXPORT_C_INCLUDE_DIRS := \
+    $(LOCAL_PATH)/api \
+    $(LOCAL_PATH)/api/mraa
+
+LOCAL_MODULE_TAGS := optional
+
+include $(BUILD_SHARED_LIBRARY)
+