package/libsigc: switch to https download

Signed-off-by: Daniel Lang <d.lang@abatec.at>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libsigc/libsigc.hash

@@ -1,4 +1,4 @@
-# From http://ftp.gnome.org/pub/gnome/sources/libsigc++/3.4/libsigc++-3.4.0.sha256sum
+# From https://download.gnome.org/sources/libsigc++/3.4/libsigc++-3.4.0.sha256sum
 sha256  02e2630ffb5ce93cd52c38423521dfe7063328863a6e96d41d765a6116b8707e  libsigc++-3.4.0.tar.xz
 
 # Locally calculated

package/libsigc/libsigc.mk

@@ -7,7 +7,7 @@
 LIBSIGC_VERSION_MAJOR = 3.4
 LIBSIGC_VERSION = $(LIBSIGC_VERSION_MAJOR).0
 LIBSIGC_SOURCE = libsigc++-$(LIBSIGC_VERSION).tar.xz
-LIBSIGC_SITE = http://ftp.gnome.org/pub/GNOME/sources/libsigc++/$(LIBSIGC_VERSION_MAJOR)
+LIBSIGC_SITE = https://download.gnome.org/sources/libsigc++/$(LIBSIGC_VERSION_MAJOR)
 LIBSIGC_INSTALL_STAGING = YES
 LIBSIGC_LICENSE = LGPL-3.0+
 LIBSIGC_LICENSE_FILES = COPYING