THRIFT-3617 cmake: include `gv` and `xml` generators in build
Client: Build (Compiler)
Patch: Stig Bakken

This closes #851
diff --git a/compiler/cpp/CMakeLists.txt b/compiler/cpp/CMakeLists.txt
index 94b3c19..2fdc800 100644
--- a/compiler/cpp/CMakeLists.txt
+++ b/compiler/cpp/CMakeLists.txt
@@ -122,6 +122,8 @@
 THRIFT_ADD_COMPILER(go      "Enable compiler for Go" ON)
 THRIFT_ADD_COMPILER(d       "Enable compiler for D" ON)
 THRIFT_ADD_COMPILER(lua     "Enable compiler for Lua" ON)
+THRIFT_ADD_COMPILER(gv      "Enable compiler for GraphViz" ON)
+THRIFT_ADD_COMPILER(xml     "Enable compiler for XML" ON)
 
 # Thrift is looking for include files in the src directory
 # we also add the current binary directory for generated files