xlib_libxshmfence: drop AUTORECONF

xlib_libxshmfence: drop AUTORECONF

In commit 2524acd4179fccc627a72ff188bf51c95fed9867
("package/x11r7/xlib_libxshmfence: bump version to 1.3"), the patch
0001-configure.ac-call-AC_USE_SYSTEM_EXTENSIONS.patch was dropped, but
the corresponding AUTORECONF = YES was not dropped.

This causes a build issue if just xlib_libxshmfence is built (using
"make xlib_libxshmfence" or using per-package host/target directories):

  >>> xlib_libxshmfence 1.3 Autoreconfiguring
  configure.ac:40: error: must install xorg-macros 1.3 or later before running autoconf/autogen
  configure.ac:40: the top level

This commit fixes that by dropping the no longer needed
AUTORECONF = YES.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>