Add license exception for gcc-10

As package gcc-8, gcc-10 source package provides different binary packages
under GPL-3, however, the ones meant to be installed in target images
are granted by GCC Runtime Library Exception. In order to make that clear
update the license exception page accordingly.

Signed-off-by: Walter Lozano <walter.lozano@collabora.com>

content/policies/license-exceptions.md

@@ -100,6 +100,59 @@ Each exception must provide the following information:
 </tr>
 </table>
 
+## gcc-10
+
+<table>
+<colgroup>
+  <col style="width: 20%" />
+  <col style="width: 80%" />
+</colgroup>
+<tr>
+  <th>project</th>
+  <td>gcc-10</td>
+</tr>
+<tr>
+  <th>component</th>
+  <td>apertis:*:target</td>
+</tr>
+<tr>
+  <th>date</th>
+  <td>August 11, 2021</td>
+</tr>
+<tr>
+  <th>validator</th>
+  <td>wlozano</td>
+</tr>
+<tr>
+  <th>rule</th>
+  <td>No GPL v3</td>
+</tr>
+<tr>
+  <th>reason</th>
+  <td>
+    <p>The GCC source package is granted exception to be present in target repository component
+    because it produces binary packages covered by different licensing terms:</p>
+    <ul>
+      <li>the compiler packages are released under the GPL-3</li>
+      <li> the <code>libgcc</code> runtime library is covered by the
+        <a href="https://www.gnu.org/licenses/gcc-exception-3.1-faq.html">GCC Runtime Library Exceptions</a>
+      </li>
+    </ul>
+    <p>Programs compiled with GCC link to the <code>libgcc</code> library to implement some compiler intrinsics,
+    which means that the <code>libgcc</code> must live in the <code>apertis:*:target</code> component
+    since it is a direct runtime dependency of packages in the same component.</p>
+    <p>For this reason, an exception is granted to the <code>gcc</code> source package
+    on the ground that:</p>
+    <ul>
+      <li>code that is shipped on target devices (that is, <code>libgcc</code>) is covered by the
+        <a href="https://www.gnu.org/licenses/gcc-exception-3.1-faq.html">GCC Runtime Library Exceptions</a>
+      </li>
+      <li>the pure GPL-3 code is not meant to be shipped in target devices</li>
+    </ul>
+  </td>
+</tr>
+</table>
+
 ## libtool
 
 <table>