codepeer: add targetset aliasing "gnatsas" to "codepeer"

This enables gradually renaming the CodePeer product into GNATSAS, see
eng/gpr/gpr-issues#103 for more information.

Author: glacambre

db/compilers.xml

@@ -219,7 +219,7 @@
 
   <compiler_description>
     <name>GNAT_CODEPEER</name>
-    <executable prefix="1">(.*gnsa-|.*codepeer-)gnatls</executable>
+    <executable prefix="1">(.*gnatsas-|.*gnsa-|.*codepeer-)gnatls</executable>
     <version>
       <external>${PREFIX}gnatls -v</external>
       <grep regexp="^GNATLS.+?(\d+(\.\d+)?)" group="1"></grep>

db/targetset.xml

@@ -665,4 +665,9 @@
     <target>ccg</target>
   </targetset>
 
+  <targetset canonical="codepeer">
+    <target>gnatsas</target>
+    <target>codepeer</target>
+  </targetset>
+
 </gprconfig>