Force inlining Correction::isSingleQuote

Also, only apply -Winline with GCC 4.6. There are some copy constructors
that GCC 4.7/4.8 fail to inline.

Change-Id: I97906045224e89377e8ea6add07a79fa088648af
diff --git a/native/jni/Android.mk b/native/jni/Android.mk
index 3735ec0..7f80dc5 100644
--- a/native/jni/Android.mk
+++ b/native/jni/Android.mk
@@ -32,7 +32,7 @@
     -Wwrite-strings -Wfloat-equal -Wpointer-arith -Winit-self -Wredundant-decls -Wno-system-headers
 
 ifeq ($(TARGET_ARCH), arm)
-ifneq ($(TARGET_GCC_VERSION), 4.7)
+ifeq ($(TARGET_GCC_VERSION), 4.6)
 LOCAL_CFLAGS += -Winline
 endif # TARGET_GCC_VERSION
 endif # TARGET_ARCH