gallium: Android build fixes

A couple of simple fixes for building on Android with autotools.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>

src/gallium/auxiliary/util/u_debug_stack_android.cpp

@@ -23,7 +23,7 @@
 
 #include <backtrace/Backtrace.h>
 
-#include "u_debug.h"
+#include "util/u_debug.h"
 #include "u_debug_stack.h"
 #include "util/hash_table.h"
 #include "os/os_thread.h"

src/gallium/drivers/freedreno/Makefile.am

@@ -7,6 +7,7 @@ AM_CFLAGS = \
 	-I$(top_srcdir)/src/freedreno \
 	-I$(top_builddir)/src/compiler/nir \
 	-I$(top_srcdir)/src/compiler/nir \
+	$(LIBDRM_CFLAGS) \
 	$(GALLIUM_DRIVER_CFLAGS)
 
 noinst_LTLIBRARIES = libfreedreno.la