Turn on -Wall for recovery modules

Turn on -Wall for all modules. Also remove the obsolete file_cmp() in
apply_patch test and now() in wear_ui.

The only exception is lib_edify due to the unused functions in the
intermediate cpp files generated from the lex files. It will be handled
in a seperate CL.

Bug: 64939312
Test: mma, unit tests pass
Change-Id: Ic53f76b60b6401ab20db3d98130d674c08e3702f
diff --git a/minui/Android.mk b/minui/Android.mk
index 4dfc65f..9246984 100644
--- a/minui/Android.mk
+++ b/minui/Android.mk
@@ -32,7 +32,7 @@
     libpng \
     libbase
 
-LOCAL_CFLAGS := -Werror
+LOCAL_CFLAGS := -Wall -Werror
 LOCAL_C_INCLUDES := $(LOCAL_PATH)/include
 LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)/include
 
@@ -68,7 +68,7 @@
     libpng \
     libbase
 
-LOCAL_CFLAGS := -Werror
+LOCAL_CFLAGS := -Wall -Werror
 LOCAL_C_INCLUDES := $(LOCAL_PATH)/include
 LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)/include
 include $(BUILD_SHARED_LIBRARY)