Unconditionally disable network check for new versions (from Fedora).

diff -u /home/dlove/rpmbuild/BUILD/cube-4.3.4/src/GUI-qt/display/VersionCheckWidget.cpp\~ /home/dlove/rpmbuild/BUILD/cube-4.3.4/src/GUI-qt/display/VersionCheckWidget.cpp
--- cube-4.3.4/src/GUI-qt/display/VersionCheckWidget.cpp~	2016-04-03 00:05:37.942066948 +0100
+++ cube-4.3.4/src/GUI-qt/display/VersionCheckWidget.cpp	2016-05-06 17:16:31.648143908 +0100
@@ -52,7 +52,8 @@
     url              = QUrl( UPDATE_CHECK_URL );
     download         = NULL;
     update_Available = false;
-    bool no_http = env_str2bool( getenv( "CUBE_DISABLE_HTTP_DOCS" ) );
+    // bool no_http = env_str2bool( getenv( "CUBE_DISABLE_HTTP_DOCS" ) );
+    bool no_http = true;
     if ( !no_http )
     {
         updateDescription =   tr( "Check for update is not performed yet." );

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<tr><td><span title='2018-03-27 21:35:41 -0400'>2018-03-27</span></td><td><a href='/guix/commit/gnu/packages/avr.scm?id=e3cfef22c4a18cacf33356a70788503fd689b96d'>gnu: Use invoke and return #t from all builders.</a><span class='msg-avail'>...</span></td><td>Mark H Weaver</td></tr>
<tr><td><span title='2018-02-16 11:11:40 +0100'>2018-02-16</span></td><td><a href='/guix/commit/gnu/packages/avr.scm?id=340978d7b054dcde6c3334267b40a8293eb0ce85'>gnu: Use HTTPS for supported nongnu.org home pages.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2017-12-20 23:18:24 +0100'>2017-12-20</span></td><td><a href='/guix/commit/gnu/packages/avr.scm?id=4305176096d192e09673b05e7a1049501607b809'>gnu: microscheme: Fix home page.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2017-09-22 12:21:09 +0200'>2017-09-22</span></td><td><a href='/guix/commit/gnu/packages/avr.scm?id=9fc513ad101c802ad46dd65bc5886b6318abc096'>gnu: Use xxd instead of vim.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2017-06-20 18:10:35 +0530'>2017-06-20</span></td><td><a href='/guix/commit/gnu/packages/avr.scm?id=148585c240f848ad08f6541ede7db3fca3411007'>gnu: Move contents of zip module into compression module.</a><span class='msg-avail'>...</span></td><td>Arun Isaac</td></tr>
<tr><td><span title='2017-05-24 23:29:35 +0200'>2017-05-24</span></td><td><a href='/guix/commit/gnu/packages/avr.scm?id=6a34e2ae2875e8152f90ad1337832e60b8a85ce1'>gnu: avr-gcc-4.9: Use gcc-4.9 as base compiler.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2017-05-24 23:29:20 +0200'>2017-05-24</span></td><td><a href='/guix/commit/gnu/packages/avr.scm?id=7b3318e34f4e2743254a88b908859901db960e9a'>gnu: Allow overriding of xgcc package in cross-gcc.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>