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Allow building plain armeabi binaries for android

Building with "make OS=android APP_ABI=armeabi" will
produce arm binaries that will conform to the armeabi
ABI - not using any features outside of armv5te by
default (but still optionally using the NEON functions at
runtime if detected - even though such devices should rather
use the default armeabi-v7a build).

--- a/build/platform-android.mk

+++ b/build/platform-android.mk

@@ -4,10 +4,12 @@

 GCCVERSION = 4.8

 NDKLEVEL = 12

 ifeq ($(ARCH), arm)

+  ifneq ($(APP_ABI), armeabi)

     CFLAGS += -march=armv7-a -mfloat-abi=softfp

     CFLAGS += -mfpu=vfpv3-d16

     LDFLAGS += -march=armv7-a -Wl,--fix-cortex-a8

     APP_ABI = armeabi-v7a

+  endif

     TOOLCHAINPREFIX = $(shell NDK_PROJECT_PATH=./codec/build/android/dec make --no-print-dir -f $(NDKROOT)/build/core/build-local.mk DUMP_TOOLCHAIN_PREFIX APP_ABI=armeabi)

   ifeq (Yes, $(USE_ASM))

     ASMFLAGS += -march=armv7-a -mfpu=neon