Rename man pages to .1 when installing


git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@4553 3789f03b-4d11-0410-bbf8-ca57d06f2519
diff --git a/unix/CMakeLists.txt b/unix/CMakeLists.txt
index 36fe339..7a2fc85 100644
--- a/unix/CMakeLists.txt
+++ b/unix/CMakeLists.txt
@@ -8,4 +8,4 @@
 endif()
 
 install(PROGRAMS vncserver DESTINATION bin)
-install(FILES vncserver.man DESTINATION man/man1)
+install(FILES vncserver.man DESTINATION man/man1 RENAME vncserver.1)