Update cecil (#3180)

To pick up RVA field fix

external/Mono.Cecil.overrides

@@ -1,9 +1,5 @@
 <Project>
 
-  <!-- Cecil's Directory.Build.Props imports this file if it
-       exists. We use it to import our own Directory.Build.props. -->
-  <Import Project="$([MSBuild]::GetPathOfFileAbove('Directory.Build.props', '$(MSBuildThisFileDirectory)../'))" />
-
   <PropertyGroup>
     <!-- Cecil sets PublicSign on windows, but we always want to
          PublicSign. -->
@@ -27,6 +23,10 @@
     <PublicKey>00240000048000009400000006020000002400005253413100040000010001002b5c9f7f04346c324a3176f8d3ee823bbf2d60efdbc35f86fd9e65ea3e6cd11bcdcba3a353e55133c8ac5c4caaba581b2c6dfff2cc2d0edc43959ddb86b973300a479a82419ef489c3225f1fe429a708507bd515835160e10bc743d20ca33ab9570cfd68d479fcf0bc797a763bec5d1000f0159ef619e709d915975e87beebaf</PublicKey>
     <PublicKeyToken>50cebf1cceb9d05e</PublicKeyToken>
     <NoWarn>$(NoWarn);0618</NoWarn>
+    <!-- When building cecil as a submodule, use the Mono.Cecil.* package IDs
+         instead of the Microsoft.DotNet.Cecil.*, so that the ILLink reference package
+         depends on the publicly available package. -->
+    <PackageId>$(MSBuildProjectName)</PackageId>
   </PropertyGroup>
 
 </Project>

external/cecil

@@ -1 +1 @@
-Subproject commit 1840b7410d37a613e684b6f9650e39e2d4950bbb
+Subproject commit 2941911af1e028ec4b508cbb8c326003089bc610