Fix sword library detection on multiarch systems

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>

sword.m4

@@ -28,7 +28,8 @@ AC_ARG_ENABLE(static-sword,
 dnl try to find Sword library files
 AC_MSG_CHECKING([for Sword library files])
 AC_REQUIRE([AC_FIND_ZLIB])
-ac_sword_library_dirs="$ac_sword_dir/lib $libdir $libdir/sword /usr/lib64 /usr/lib /usr/local/lib64 /usr/local/lib /usr/local/lib/sword /usr/local/sword/lib"
+sword_multiarch="`gcc -print-multiarch 2>/dev/null`"
+ac_sword_library_dirs="$ac_sword_dir/lib64 $ac_sword_dir/lib/$sword_multiarch $ac_sword_dir/lib $libdir/$sword_multiarch $libdir $libdir/sword /usr/lib64 /usr/lib/$sword_multiarch /usr/lib /usr/local/lib64 /usr/local/lib/$sword_multiarch /usr/local/lib /usr/local/lib/sword /usr/local/sword/lib"
 
 if test "x$ac_static_sword" = "xYES"; then
 	SEARCH_LIBS="libsword.a";