Work around a bug involving dependent libraries when building 64 bit on Mac OS X

This commit was SVN r13246.

autogen.sh

@@ -433,6 +433,13 @@ EOF
             echo "     ==> your libtool doesn't need this! yay!"
         fi
 	cd ../..
+        echo "  -- patching 64-bit OS X bug in ltmain.sh"
+        if test ! -z "`grep otool config/ltmain.sh`" -a \
+              -z "`grep otool64 config/ltmain.sh`"; then
+            patch -N -p0 < config/ltmain_otool.diff
+        else
+            echo "     ==> your libtool doesn't need this! yay!"
+        fi
 	echo "  -- patching configure for broken -c/-o compiler test"
 	sed -e 's/chmod -w \./#OMPI\/MPI FIX: chmod -w ./' \
 	    configure > configure.new

config/ltmain_otool.diff

@@ -0,0 +1,13 @@
+--- config/ltmain.sh.old	2007-01-22 11:34:19.000000000 -0500
++++ config/ltmain.sh	2007-01-22 11:34:43.000000000 -0500
+@@ -4428,6 +4428,10 @@
+ 		      depdepl="$absdir/$objdir/$depdepl"
+ 		      darwin_install_name=`otool -L $depdepl | $SED -n -e '3q;2,2p' | $SED -e 's/(.*//'`
+ 		      darwin_install_name=`$ECHO $darwin_install_name`
++                      if test -z "$darwin_install_name"; then
++                          darwin_install_name=`otool64 -L $depdepl | $SED -n -e '3q;2,2p' | $SED -e 's/(.*//'`
++                          darwin_install_name=`$ECHO $darwin_install_name`
++                      fi
+ 		      compiler_flags="$compiler_flags ${wl}-dylib_file ${wl}${darwin_install_name}:${depdepl}"
+ 		      linker_flags="$linker_flags -dylib_file ${darwin_install_name}:${depdepl}"
+ 		      path=