[banshee] build: Add System.Core ref to Banshee.AmazonMp3 project (bgo#639640)

[Gabriel Burt <gburt src gnome org>]

commit 30a7bd92bc2bb3941dcdd6374bd8be2d09325f76
Author: Dustin C. Hatch <admiralnemo gmail com>
Date:   Sat Jan 15 20:30:28 2011 -0600

    build: Add System.Core ref to Banshee.AmazonMp3 project (bgo#639640)
    
    Signed-off-by: Gabriel Burt <gabriel burt gmail com>

 .../Banshee.AmazonMp3/Banshee.AmazonMp3.csproj     |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/Extensions/Banshee.AmazonMp3/Banshee.AmazonMp3.csproj b/src/Extensions/Banshee.AmazonMp3/Banshee.AmazonMp3.csproj
index 6f58af4..d752995 100644
--- a/src/Extensions/Banshee.AmazonMp3/Banshee.AmazonMp3.csproj
+++ b/src/Extensions/Banshee.AmazonMp3/Banshee.AmazonMp3.csproj
@@ -39,6 +39,7 @@
       <Package>gtk-sharp-2.0</Package>
     </Reference>
     <Reference Include="System" />
+    <Reference Include="System.Core" />
     <Reference Include="Mono.Posix">
       <SpecificVersion>False</SpecificVersion>
       <HintPath>..\..\..bin\Mono.Posix.dll</HintPath>