Add the missing sr-Latn into png files and rename the png locale header

Switch the locale header in the png files from Locale.toString() to
Locale.toLanguageTag(). For example, en_US --> en-us and sr__#Latn
--> sr-Latn. Also clean up recovery a bit to expect the new locale
format.

Bug: 35215015
Test: sr-Latn shows correctly under graphic tests && recovery tests pass
Change-Id: Ic62bab7756cdc6e5f98f26076f7c2dd046f811db
diff --git a/minui/Android.mk b/minui/Android.mk
index 281f649..4dfc65f 100644
--- a/minui/Android.mk
+++ b/minui/Android.mk
@@ -28,7 +28,10 @@
     libdrm \
     libsync_recovery
 
-LOCAL_STATIC_LIBRARIES := libpng
+LOCAL_STATIC_LIBRARIES := \
+    libpng \
+    libbase
+
 LOCAL_CFLAGS := -Werror
 LOCAL_C_INCLUDES := $(LOCAL_PATH)/include
 LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)/include
@@ -61,7 +64,10 @@
 include $(CLEAR_VARS)
 LOCAL_MODULE := libminui
 LOCAL_WHOLE_STATIC_LIBRARIES += libminui
-LOCAL_SHARED_LIBRARIES := libpng
+LOCAL_SHARED_LIBRARIES := \
+    libpng \
+    libbase
+
 LOCAL_CFLAGS := -Werror
 LOCAL_C_INCLUDES := $(LOCAL_PATH)/include
 LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)/include