Update build rules for Android

As the "register" keyword is now no longer used by the Tesseract code,
the compiler option -Wno-error=deprecated-register can be removed.

Signed-off-by: Stefan Weil <sw@weilnetz.de>

android/jni/Application.mk

@@ -7,7 +7,7 @@ else
 endif
 
 # Specify the hash namespace that we're using, based on the APP_STL we're using.
-APP_CFLAGS += -Werror -DHASH_NAMESPACE=__gnu_cxx -Wno-error=deprecated-register
+APP_CFLAGS += -Werror -DHASH_NAMESPACE=__gnu_cxx
 APP_PLATFORM := android-16
 APP_STL := gnustl_static
 NDK_TOOLCHAIN_VERSION := clang