move GraphicEnv from libgui to libui

This breaks a circular dependency between libEGL
and libgui.

Test: compiled and booted a device
Change-Id: I78932bba07fb9ef310d8e1622bd3a47f57e89c45
diff --git a/libs/ui/Android.bp b/libs/ui/Android.bp
index 4cd0d3a..67efb84 100644
--- a/libs/ui/Android.bp
+++ b/libs/ui/Android.bp
@@ -55,6 +55,7 @@
         "GraphicBuffer.cpp",
         "GraphicBufferAllocator.cpp",
         "GraphicBufferMapper.cpp",
+        "GraphicsEnv.cpp",
         "HdrCapabilities.cpp",
         "PixelFormat.cpp",
         "Rect.cpp",
@@ -65,6 +66,7 @@
     shared_libs: [
         "android.hardware.graphics.allocator@2.0",
         "android.hardware.graphics.mapper@2.0",
+        "libnativeloader",
         "libbinder",
         "libcutils",
         "libhardware",