Android: Introduce ANDROID_HOST_BUILD and rework logging.

Avoid using the Android logger directly. Instead, use the Common/Debug
and OpenGL/common/debug paths instead, which abstracts away use of the
logger.

Add ANDRIOD_HOST_BUILD to tell the build we are building an Android
swiftshader, but minimizing the use of platform features such as the
logger.

Change-Id: Ic6c70843d947c568d0e29fe66c55af74b8559a59
Reviewed-on: https://swiftshader-review.googlesource.com/18028
Tested-by: Alistair Strachan <astrachan@google.com>
Reviewed-by: Greg Hartman <ghartman@google.com>
Reviewed-by: Lingfeng Yang <lfy@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

src/OpenGL/libEGL/Display.cpp

diff --git a/src/OpenGL/libEGL/Display.cpp b/src/OpenGL/libEGL/Display.cpp
index 5821ba9..8bbed9e 100644
--- a/src/OpenGL/libEGL/Display.cpp
+++ b/src/OpenGL/libEGL/Display.cpp
@@ -668,12 +668,12 @@
 	#elif defined(__ANDROID__)
 		if(!window)
 		{
-			ALOGE("%s called with window==NULL %s:%d", __FUNCTION__, __FILE__, __LINE__);
+			ERR("%s called with window==NULL %s:%d", __FUNCTION__, __FILE__, __LINE__);
 			return false;
 		}
 		if(static_cast<ANativeWindow*>(window)->common.magic != ANDROID_NATIVE_WINDOW_MAGIC)
 		{
-			ALOGE("%s called with window==%p bad magic %s:%d", __FUNCTION__, window, __FILE__, __LINE__);
+			ERR("%s called with window==%p bad magic %s:%d", __FUNCTION__, window, __FILE__, __LINE__);
 			return false;
 		}
 		return true;

src/OpenGL/libEGL/libEGL.cpp

diff --git a/src/OpenGL/libEGL/libEGL.cpp b/src/OpenGL/libEGL/libEGL.cpp
index b2ef237..a4f078d 100644
--- a/src/OpenGL/libEGL/libEGL.cpp
+++ b/src/OpenGL/libEGL/libEGL.cpp
@@ -1172,7 +1172,7 @@
 
 			if(!nativeBuffer || GLPixelFormatFromAndroid(nativeBuffer->format) == GL_NONE)
 			{
-				ALOGW("%s badness unsupported HAL format=%x", __FUNCTION__, nativeBuffer ? nativeBuffer->format : 0);
+				ERR("%s badness unsupported HAL format=%x", __FUNCTION__, nativeBuffer ? nativeBuffer->format : 0);
 				return error(EGL_BAD_ATTRIBUTE, EGL_NO_IMAGE_KHR);
 			}