build: split TARGET_PREFER_32_BIT for apps and executables

Introduce two new flags, TARGET_PREFER_32_BIT_APPS and
TARGET_PREFER_32_BIT_EXECUTABLES that individually control
compilation of apps and executables.  If TARGET_PREFER_32_BIT is
set, the build system will automatically set both new flags.

Change-Id: Ibd2165e688675c2884d9e7ddf82d7dd6c28521f3
diff --git a/core/package.mk b/core/package.mk
index fe4d0e4..c7d68d9 100644
--- a/core/package.mk
+++ b/core/package.mk
@@ -40,9 +40,9 @@
 
 LOCAL_NO_2ND_ARCH_MODULE_SUFFIX := true
 
-# if TARGET_PREFER_32_BIT is set, try to build 32-bit first
+# if TARGET_PREFER_32_BIT_APPS is set, try to build 32-bit first
 ifdef TARGET_2ND_ARCH
-ifeq ($(TARGET_PREFER_32_BIT),true)
+ifeq ($(TARGET_PREFER_32_BIT_APPS),true)
 LOCAL_2ND_ARCH_VAR_PREFIX := $(TARGET_2ND_ARCH_VAR_PREFIX)
 else
 LOCAL_2ND_ARCH_VAR_PREFIX :=
@@ -56,7 +56,7 @@
 include $(BUILD_SYSTEM)/package_internal.mk
 else ifneq (,$(TARGET_2ND_ARCH))
 # check if the non-preferred arch is the primary or secondary
-ifeq ($(TARGET_PREFER_32_BIT),true)
+ifeq ($(TARGET_PREFER_32_BIT_APPS),true)
 LOCAL_2ND_ARCH_VAR_PREFIX :=
 else
 LOCAL_2ND_ARCH_VAR_PREFIX := $(TARGET_2ND_ARCH_VAR_PREFIX)