build: rename LOCAL_32BIT_ONLY to LOCAL_32_BIT_ONLY

Rename for consistency with TARGET_IS_64_BIT.

Change-Id: I824dcaed0c1e88b8246bcffb21ab3f1772175926
diff --git a/core/shared_library.mk b/core/shared_library.mk
index 9a75a7b..e86bab3 100644
--- a/core/shared_library.mk
+++ b/core/shared_library.mk
@@ -10,7 +10,7 @@
 endif
 endif
 
-ifneq ($(TARGET_IS_64_BIT)|$(LOCAL_32BIT_ONLY),true|true)
+ifneq ($(TARGET_IS_64_BIT)|$(LOCAL_32_BIT_ONLY),true|true)
 # Build for TARGET_ARCH
 LOCAL_2ND_ARCH_VAR_PREFIX :=
 include $(BUILD_SYSTEM)/shared_library_internal.mk