Fill uid/gid for screenshots at compile time

It's not necessary to rely on the success of a call to getpwnam() for
the uid/gid of a file stored to sdcard (or external storage). Use the
definitions in system/core/include/private/android_filesystem_config.h

Change-Id: I979cfa0c74ecc927b88b0967cc56a66da237cc60
diff --git a/gui/Android.mk b/gui/Android.mk
index 17defd9..51cf4ca 100644
--- a/gui/Android.mk
+++ b/gui/Android.mk
@@ -74,7 +74,11 @@
     LOCAL_CFLAGS += -DTW_ROUND_SCREEN
 endif
 
-LOCAL_C_INCLUDES += bionic system/core/libpixelflinger/include
+LOCAL_C_INCLUDES += \
+    bionic \
+    system/core/include \
+    system/core/libpixelflinger/include
+
 ifeq ($(shell test $(PLATFORM_SDK_VERSION) -lt 23; echo $$?),0)
     LOCAL_C_INCLUDES += external/stlport/stlport
 endif