libsigc: Don't copy devel documentation onto target

The libsigc++ developer documentation was being copied onto the target.
Add a clean-up to fix that.

Signed-off-by: Charles Manning <cdhmanning@gmail.com>
Acked-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
diff --git a/package/libsigc/libsigc.mk b/package/libsigc/libsigc.mk
index 92d1d8b..10f5803 100644
--- a/package/libsigc/libsigc.mk
+++ b/package/libsigc/libsigc.mk
@@ -8,4 +8,10 @@
 LIBSIGC_SITE = http://ftp.gnome.org/pub/GNOME/sources/libsigc++/2.2
 LIBSIGC_INSTALL_STAGING = YES
 
+define LIBSIGC_INSTALL_TARGET_FIXUP
+	rm -rf $(TARGET_DIR)/usr/share/devhelp/books/libsigc++*
+endef
+
+LIBSIGC_POST_INSTALL_TARGET_HOOKS += LIBSIGC_INSTALL_TARGET_FIXUP
+
 $(eval $(autotools-package))