fix srcdir for libs/apr/configure.gnu (FSBUILD-211)

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@15648 d0543943-73ff-0310-b7d9-9358b9ac24b2

libs/apr/configure.gnu

 #! /bin/sh
-./configure "$@" --disable-shared --with-pic
+srcpath=$(dirname $0 2>/dev/null )  || srcpath="." 
+$srcpath/configure "$@" --disable-shared --with-pic