neon is armv7 with NEON instructions support, not all armv7 devices support it. All armv7 android devices support VFP, so you're safe using armv7 or vfp for armeabi-v7a. armv6 is equivalent to Android armeabi.
x86 and mips are different architectures, you need a .so for these folders as well, but your other compilation doesn't seem to provide these out of the box ?