[OE-core] [BUG] gcc: require neon on arch without neon

[Yi Qingliang]

when compiling qtbase in meta-qt5, it says:
| ../../include/QtCore/../../../git/src/corelib/global/qendian.h:143:36:
fatal error: You must enable NEON instructions (e.g.
-mfloat-abi=softfp -mfpu=neon) to use these intrinsics.
|      return __builtin_bswap16(source);
|                                     ^


bug description:
      https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71056
upstream patch:
      https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=236910
mirror on github:
    https://github.com/gcc-mirror/gcc/commit/84d2a5509892b65ed60d39e6e2f9719e3762e40e

Yi Qingliang