Replace links into the web repository from hg.savannah.nongnu.org to github.com

History links have been preserved, though.

doc/index.html

@@ -461,7 +461,7 @@ USE_OSGPLUGIN(<plugin2>)
 
     <p>
     You can also browse the
-    <a href="http://hg.savannah.nongnu.org/hgweb/mingw-cross-env">web repository</a>.
+    <a href="https://github.com/mxe/mxe">web repository</a>.
     </p>
 
     <p>
@@ -919,13 +919,13 @@ USE_OSGPLUGIN(&lt;plugin2&gt;)
         For instance,
         when adding a GNU library,
         you should take a package like
-        <a href="http://hg.savannah.gnu.org/hgweb/mingw-cross-env/file/tip/src/gettext.mk">gettext.mk</a>
+        <a href="https://github.com/mxe/mxe/blob/master/src/gettext.mk">gettext.mk</a>
         or
-        <a href="http://hg.savannah.gnu.org/hgweb/mingw-cross-env/file/tip/src/libiconv.mk">libiconv.mk</a>
+        <a href="https://github.com/mxe/mxe/blob/master/src/libiconv.mk">libiconv.mk</a>
         as the base of your work.
         When using a SourceForge project,
         you could start with a copy of
-        <a href="http://hg.savannah.gnu.org/hgweb/mingw-cross-env/file/tip/src/xmlwrapp.mk">xmlwrapp.mk</a>.
+        <a href="https://github.com/mxe/mxe/blob/master/src/xmlwrapp.mk">xmlwrapp.mk</a>.
         And so on.
         </p>
     </li>
@@ -964,7 +964,7 @@ USE_OSGPLUGIN(&lt;plugin2&gt;)
         <p>
         You might also have to provide a patch for it.
         In that case, have a look at other patches such as
-        <a href="http://hg.savannah.gnu.org/hgweb/mingw-cross-env/file/tip/src/sdl-2-fix-dinput.patch">sdl-2-fix-dinput.patch</a>.
+        <a href="https://github.com/mxe/mxe/blob/master/src/sdl-2-fix-dinput.patch">sdl-2-fix-dinput.patch</a>.
         In particular, each patch file should be named as:
         </p>
         <pre>PACKAGE-PATCHNUMBER-DESCRIPTION.patch</pre>
@@ -1015,7 +1015,7 @@ https://...</pre>
         depending on whether it is a C or C++ library.
         To get a clue,
         please have a look at existing test programs such as
-        <a href="http://hg.savannah.gnu.org/hgweb/mingw-cross-env/file/tip/src/sdl-test.c">sdl-test.c</a>.
+        <a href="https://github.com/mxe/mxe/blob/master/src/sdl-test.c">sdl-test.c</a>.
         </p>
 
         <p>
@@ -1023,7 +1023,7 @@ https://...</pre>
         you should build the test program in a generic way,
         using strict compiler flags.
         The last few lines of
-        <a href="http://hg.savannah.gnu.org/hgweb/mingw-cross-env/file/tip/src/sdl.mk">sdl.mk</a>
+        <a href="https://github.com/mxe/mxe/blob/master/src/sdl.mk">sdl.mk</a>
         will give you a clue.
         </p>
     </li>