Install manual page to the correct location.

Index: doc/CMakeLists.txt
--- doc/CMakeLists.txt.orig
+++ doc/CMakeLists.txt
@@ -20,6 +20,6 @@ if (UNIX AND NOT APPLE)
 		)
 	INSTALL (
 		FILES ${man1}
-		DESTINATION "share/man/man1"
+		DESTINATION "man/man1"
 		)
 endif ()
