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Don't set -mfpu=neon while building the normal C++ files

This will make the normal C++ code not run on non-NEON devices at
all, making the runtime CPU feature detection pointless.

Adding -mfpu=neon to CFLAGS is not necessary, it's enough to
add it while building those individual .S files (via ASMFLAGS).

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

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

@@ -8,11 +8,7 @@

     GCCPATHPREFIX = arm-linux-androideabi

     GCCPREFIX = arm-linux-androideabi

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

-  ifeq (Yes, $(HAVE_NEON))

-    CFLAGS += -mfpu=neon

-  else

     CFLAGS += -mfpu=vfpv3-d16

-  endif

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

     APP_ABI = armeabi-v7a

   ifeq (Yes, $(USE_ASM))