docs, package/gcc: switch to Gitlab issue tracker

Our Bugzilla is so slow and unstable that it has become
unusable. Let's switch to using the Gitlab issue tracker instead.

There are still lots of references to the Bugzilla bug tracker in our
News page at https://buildroot.org/news.html, but these are for older
news.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
[yann.morin.1998@free.fr: don't needlessly re-flow]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

docs/manual/contribute.adoc

@@ -25,7 +25,7 @@ for more information on obtaining a Buildroot git tree.
 === Reproducing, analyzing and fixing bugs
 
 A first way of contributing is to have a look at the open bug reports in
-the https://bugs.buildroot.org/buglist.cgi?product=buildroot[Buildroot bug
+the https://gitlab.com/buildroot.org/buildroot/-/issues[Buildroot bug
 tracker]. As we strive to keep the bug count as small as possible, all
 help in reproducing, analyzing and fixing reported bugs is more than
 welcome. Don't hesitate to add a comment to bug reports reporting your

docs/manual/resources.adoc

@@ -40,7 +40,7 @@ better as it will reach more people, both developers and users.
 Bug tracker::
 +
 Bugs in Buildroot can be reported via the mailing list or alternatively
-via the https://bugs.buildroot.org/buglist.cgi?product=buildroot[Buildroot
+via the https://gitlab.com/buildroot.org/buildroot/-/issues[Buildroot
 bugtracker]. Please refer to xref:reporting-bugs[] before creating a bug
 report.
 

docs/website/contribute.html

@@ -13,7 +13,7 @@
 
       <ul>
 	<li>Reproducing, analyzing and fixing bugs from our
-	  <a href="https://bugs.buildroot.org/">bug tracker</a></li>
+	  <a href="https://gitlab.com/buildroot.org/buildroot/-/issues">bug tracker</a></li>
 	<li>Analyzing and fixing <a href="http://autobuild.buildroot.org/">
 	    autobuild failures</a></li>
 	<li>Reviewing and testing patches sent by other developers. See the

docs/website/support.html

@@ -81,7 +81,7 @@
 		</div>
 		<div class="col-sm-11">
 		  <p>If you think you found a bug in Buildroot, you can use the
-		    <a href="https://bugs.buildroot.org/">Bug Tracker</a> to post your bugs and/or
+		    <a href="https://gitlab.com/buildroot.org/buildroot/-/issues">Bug Tracker</a> to post your bugs and/or
 		    participate to find solutions to existing problems.</p>
 
 		  <p>Note: patches are only accepted through the mailing list.</p>