Require opt-in for NVEnc support.  Otherwise the default is true with no way
to disable it.

--- HandBrake-1.2.0/make/configure.py.orig	1969-12-31 18:00:00.000000000 -0600
+++ HandBrake-1.2.0/make/configure.py	2019-01-22 23:22:46.186959060 -0600
@@ -1320,7 +1320,7 @@
     grp.add_option( '--disable-ffmpeg-aac', dest="enable_ffmpeg_aac", action='store_false' )
 
     h = IfHost( 'enable Nvidia NVEnc video encoder', '*-*-*', none=optparse.SUPPRESS_HELP ).value
-    grp.add_option( '--enable-nvenc', dest="enable_nvenc", default=not (host.match( '*-*-darwin*' ) or host.match( '*-*-freebsd*' )), action='store_true', help=h )
+    grp.add_option( '--enable-nvenc', dest="enable_nvenc", default=False, action='store_true', help=h )
 
 
     cli.add_option_group( grp )
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<div class='path'>path: <a href='/guix/log/?id=4c2ce29536b2c3c88f612f0f5e6b40884c52bc4c'>root</a>/<a href='/guix/log/gnu?id=4c2ce29536b2c3c88f612f0f5e6b40884c52bc4c'>gnu</a>/<a href='/guix/log/gnu/services?id=4c2ce29536b2c3c88f612f0f5e6b40884c52bc4c'>services</a>/<a href='/guix/log/gnu/services/rsync.scm?id=4c2ce29536b2c3c88f612f0f5e6b40884c52bc4c'>rsync.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/services/rsync.scm?id=4c2ce29536b2c3c88f612f0f5e6b40884c52bc4c&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2017-09-23 21:07:27 +0100'>2017-09-23</span></td><td><a href='/guix/commit/gnu/services/rsync.scm?id=9db7e9be59820190a97de22ba72e71fa25f9d168'>gnu: Add rsync service.</a><span class='msg-avail'>...<span class='msg-tooltip'>* doc/guix.texi (Networking Services): Add rsync service documentation.
* gnu/services/rsync.scm (&lt;rsync-configuration&gt;): New file.
* gnu/tests/rsync.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add new files.

Signed-off-by: Christopher Baines &lt;mail@cbaines.net&gt;
</span></span></td><td>Oleg Pykhalov</td></tr>