minuitwrp: Fix detection of libdrm on Pie

external/libdrm was fully converted to Android.bp on Pie, causing
the wildcard to match nothing, even though libdrm is present in
the build tree. Change it to cover both build files.

Change-Id: I4b092b29ac021cc1aa3bcf7346b225b79fd99f4b
diff --git a/minuitwrp/Android.mk b/minuitwrp/Android.mk
index 09bdb8d..3b0f7de 100644
--- a/minuitwrp/Android.mk
+++ b/minuitwrp/Android.mk
@@ -45,7 +45,7 @@
   LOCAL_CFLAGS += -DNEW_ION_HEAP
 endif
 
-ifneq ($(wildcard external/libdrm/Android.mk),)
+ifneq ($(wildcard external/libdrm/Android.*),)
   LOCAL_CFLAGS += -DHAS_DRM
   LOCAL_SRC_FILES += graphics_drm.cpp
   ifneq ($(wildcard external/libdrm/Android.common.mk),)