The configure test for ebx fails because it is run before the -mdynamic-no-pic

check. Move it before the ebx test and remove -mdynamic-no-pic from
VHOOKCFLAGS later on.
patch by Alexander Strange, astrange ithinksw com
reference:
Subject: [Ffmpeg-devel] [PATCH] fix CONFIG_EBX_AVAILABLE on Darwin/x86
Date: Fri, 13 Apr 2007 17:24:55 -0400

Originally committed as revision 8863 to svn://svn.ffmpeg.org/ffmpeg/trunk