Fix build with clang 3.4

Submitted by:	dim

audio/libmad/files/patch-configure

@@ -0,0 +1,39 @@
+--- configure.orig	2014-02-11 23:45:49.000000000 +0100
++++ configure	2014-02-11 23:50:50.000000000 +0100
+@@ -19096,24 +19096,30 @@
+ 	esac
+     fi
+ 
++    if $CC -v 2>&1 | grep clang > /dev/null; then
++	CLANG=yes
++    else
++	CLANG=no
++    fi
++
+     case "$optimize" in
+ 	-O|"-O "*)
+ 	    optimize="-O"
+ 	    optimize="$optimize -fforce-mem"
+-	    optimize="$optimize -fforce-addr"
++	    test $CLANG = no && optimize="$optimize -fforce-addr"
+ 	    : #x optimize="$optimize -finline-functions"
+ 	    : #- optimize="$optimize -fstrength-reduce"
+-	    optimize="$optimize -fthread-jumps"
+-	    optimize="$optimize -fcse-follow-jumps"
+-	    optimize="$optimize -fcse-skip-blocks"
++	    test $CLANG = no && optimize="$optimize -fthread-jumps"
++	    test $CLANG = no && optimize="$optimize -fcse-follow-jumps"
++	    test $CLANG = no && optimize="$optimize -fcse-skip-blocks"
+ 	    : #x optimize="$optimize -frerun-cse-after-loop"
+ 	    : #x optimize="$optimize -frerun-loop-opt"
+ 	    : #x optimize="$optimize -fgcse"
+ 	    optimize="$optimize -fexpensive-optimizations"
+-	    optimize="$optimize -fregmove"
++	    test $CLANG = no && optimize="$optimize -fregmove"
+ 	    : #* optimize="$optimize -fdelayed-branch"
+ 	    : #x optimize="$optimize -fschedule-insns"
+-	    optimize="$optimize -fschedule-insns2"
++	    test $CLANG = no && optimize="$optimize -fschedule-insns2"
+ 	    : #? optimize="$optimize -ffunction-sections"
+ 	    : #? optimize="$optimize -fcaller-saves"
+ 	    : #> optimize="$optimize -funroll-loops"