build: Rename doc/ -> apidoc/

This is preparation for introducing a `mkdocs` manual under `doc/`
which should be significantly more useful for the world at large than
the minimal manual that exists there now.

Makefile.am

@@ -32,7 +32,7 @@ DISTCHECK_CONFIGURE_FLAGS += --enable-gtk-doc --disable-maintainer-mode
 SUBDIRS += .
 
 if ENABLE_GTK_DOC
-SUBDIRS += doc
+SUBDIRS += apidoc
 endif
 
 EXTRA_DIST += autogen.sh COPYING README.md

configure.ac

@@ -232,7 +232,7 @@ AM_CONDITIONAL(BUILDOPT_STATIC_DELTAS, test x$enable_static_deltas = xyes)
 
 AC_CONFIG_FILES([
 Makefile
-doc/Makefile
+apidoc/Makefile
 src/libostree/ostree-1.pc
 ])
 AC_OUTPUT
@@ -248,7 +248,8 @@ echo "
     SELinux:                                      $with_selinux
     libarchive (parse tar files directly):        $with_libarchive
     static deltas:                                $enable_static_deltas
-    documentation:                                $enable_gtk_doc
+    man pages (xsltproc):                         $XSLTPROC
+    api docs (gtk-doc):                           $enable_gtk_doc
     gjs-based tests:                              $have_gjs
     dracut:                                       $with_dracut
     mkinitcpio:                                   $with_mkinitcpio"