[gnome-calendar] build: fix uninstall-local

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit f7457b30741cf859190caa2c5e9b9870f7da5048
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Mon May 25 15:08:56 2015 -0300

    build: fix uninstall-local

 Makefile.am |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 208f504..c0ae485 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -27,7 +27,10 @@ DISTCHECK_CONFIGURE_FLAGS = --enable-appstream-util
 
 # Remove doc directory on uninstall
 uninstall-local:
-       -rm -r $(gnome_calendardocdir)
+       @if test -d "$(docdir)"; \
+       then \
+               -rm -r $(docdir); \
+       fi
 
 AUTHORS:
        @if test -d "$(srcdir)/.git"; \