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/vncviewer/CMakeLists.txt b/vncviewer/CMakeLists.txt
index 3fb1145..ec89963 100644
--- a/vncviewer/CMakeLists.txt
+++ b/vncviewer/CMakeLists.txt
@@ -35,5 +35,5 @@
 
 install(TARGETS vncviewer DESTINATION bin)
 if(UNIX)
-  install(FILES vncviewer.man DESTINATION man/man1)
+  install(FILES vncviewer.man DESTINATION man/man1 RENAME vncviewer.1)
 endif()