Fix Android master build.

OpenGL ES 3.0 entry functions are exported in the exports.map version script,
but the source file defining them was not being compiled (ES3 support is still
disabled).

Change-Id: I5e42082304beb2b37de2bcc7ffcf3b2fc65ecc7d
Reviewed-on: https://swiftshader-review.googlesource.com/4732
Reviewed-by: Keun Soo Yim <yim@google.com>
Reviewed-by: Greg Hartman <ghartman@google.com>
Tested-by: Keun Soo Yim <yim@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>

src/OpenGL/libGLESv2/Android.mk

diff --git a/src/OpenGL/libGLESv2/Android.mk b/src/OpenGL/libGLESv2/Android.mk
index 0b3ca6a..bfc1e83 100644
--- a/src/OpenGL/libGLESv2/Android.mk
+++ b/src/OpenGL/libGLESv2/Android.mk
@@ -28,6 +28,7 @@
 	Framebuffer.cpp \
 	IndexDataManager.cpp \
 	libGLESv2.cpp \
+	libGLESv3.cpp \
 	main.cpp \
 	Program.cpp \
 	Query.cpp \