zbar: new package

[Thomas:
 - replace patch 0001 fixing autoreconf by a simpler patch that simply
   drops the -Wall and -Werror flags passed to automake.
 - reformat the two patches using Git
 - drop the "uclibc || glibc" dependency inherited from libv4l, since
   libv4l has now been fixed to build on musl.
 - drop the hook work arounding a build issue around man pages, and
   replace by a patch that completely disables the build/installation
   of documentation.
 - change license to LGPLv2.1+, as noted in the COPYING file.
 - drop --enable-shared=yes, since it is already passed by the
   autotools-package infrastructure]

Signed-off-by: Viacheslav Volkov <sv99@inbox.ru>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>