docs: Don’t distribute generated man pages

They should either be generated at build time, or ignored completely,
depending on the presence of --[enable|disable]-man.

Signed-off-by: Philip Withnall <withnall@endlessm.com>

docs/reference/gio/Makefile.am

@@ -232,8 +232,6 @@ endif
 CLEANFILES ?=
 CLEANFILES += $(man_MANS)
 
-EXTRA_DIST += $(man_MANS)
-
 dist-hook-local: all-local
 
 gio-docs-clean: clean

docs/reference/glib/Makefile.am

@@ -140,8 +140,6 @@ endif
 CLEANFILES ?=
 CLEANFILES += $(man_MANS)
 
-EXTRA_DIST += $(man_MANS)
-
 dist-hook-local: all-local
 
 glib-docs-clean: clean

docs/reference/gobject/Makefile.am

@@ -95,8 +95,6 @@ endif
 CLEANFILES ?=
 CLEANFILES += $(man_MANS)
 
-EXTRA_DIST += $(man_MANS)
-
 dist-hook-local: all-local
 
 gobject-docs-clean: clean