Changed build settings for ARMv5 in Android.

I found some issues in building ARMv5 with ICM. This CL includes fixes,
and a design change which now will exclude any NEON libraries unless 
the build is for dynamic detection or for Neon specifically.
Review URL: http://webrtc-codereview.appspot.com/330021

git-svn-id: http://webrtc.googlecode.com/svn/trunk@1335 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/android-webrtc.mk b/android-webrtc.mk
index eb620bb..dc92aeb 100644
--- a/android-webrtc.mk
+++ b/android-webrtc.mk
@@ -33,6 +33,11 @@
     -flax-vector-conversions
 endif
 
+ifneq (,$(filter '-DWEBRTC_DETECT_ARM_NEON' '-DWEBRTC_ARCH_ARM_NEON', \
+    $(MY_WEBRTC_COMMON_DEFS)))
+WEBRTC_BUILD_NEON_LIBS := true
+endif
+
 ifeq ($(ARCH_ARM_HAVE_ARMV7A),true)
 MY_WEBRTC_COMMON_DEFS += \
     '-DWEBRTC_ARCH_ARM_V7A'