docs: add the MD5 sums for the 9.2.1 and 9.1.7 releases

docs/relnotes/9.1.7.html

@@ -30,7 +30,9 @@ because GL_ARB_compatibility is not supported.
 
 <h2>MD5 checksums</h2>
 <pre>
-TBA
+9e4abf7b7a6db762012c3c9917a8e8c7  MesaLib-9.1.7.tar.bz2
+f1d4d479d6ce12b9566fdb379960a912  MesaLib-9.1.7.tar.gz
+abd612bfc5dd478d04fcc630dd7672f2  MesaLib-9.1.7.zip
 </pre>
 
 <h2>New features</h2>

docs/relnotes/9.2.1.html

@@ -31,7 +31,9 @@ because GL_ARB_compatibility is not supported.
 
 <h2>MD5 checksums</h2>
 <pre>
-TBA
+e6cdfa84dfddd86e3d36ec7ff4b6478a  MesaLib-9.2.1.tar.gz
+dd4c82667d9c19c28a553b12eba3f8a0  MesaLib-9.2.1.tar.bz2
+d9af0f5607f7d275793d293057ca9ac6  MesaLib-9.2.1.zip
 </pre>