replace the asm implementation for mul/square inner

Author: dderjoel

Makefile.am

@@ -37,7 +37,6 @@ noinst_HEADERS += src/field_10x26_impl.h
 noinst_HEADERS += src/field_5x52.h
 noinst_HEADERS += src/field_5x52_impl.h
 noinst_HEADERS += src/field_5x52_int128_impl.h
-noinst_HEADERS += src/field_5x52_asm_impl.h
 noinst_HEADERS += src/modinv32.h
 noinst_HEADERS += src/modinv32_impl.h
 noinst_HEADERS += src/modinv64.h