project_generate: Add debug as a reserved command line option.

Debug can be selected in the output VS projects and cannot be set via
command line.

SMP/project_generate/source/configGenerator_build.cpp

@@ -369,6 +369,7 @@ void configGenerator::buildReservedValues( vector<string> & vReservedItems )
     vReservedItems.push_back( "mm_empty" );
     vReservedItems.push_back( "ebp_available" );
     vReservedItems.push_back( "ebx_available" );
+    vReservedItems.push_back( "debug" );
 }
 
 void configGenerator::buildAdditionalDependencies( DependencyList & mAdditionalDependencies )