Log Message:
Updated to latest release, 3.91. Minor whitespace fixes in the Makefile.
Use BUILD_DIRS and MAKE_ENV instead of writing do-install phase manually.
Add sparc{,64} support to package. Fixes build on OpenBSD/sparc64 at least.
Defuzz patches. From NEWS:

==================================================================
User visible changes for UPX
==================================================================

Changes in 3.91 (30 Sep 2013):
  * Added experimental support for Windows 64-bit PE files, based on
    work by Stefan Widmann. Please use for testing only!
  * bug fixes

==================================================================

Changes in 3.09 (18 Feb 2013):
  * New option --preserve-build-id for GNU ELF.
  * Allow for code signing and LC_UUID on Mac OS X executables.
  * Allow non-contiguous LC_SEGMENTs and 0==.vmsize for Mach-O.
  * Allow zero-filled final page in PackUnix::canUnpack().
  * bug fixes