package/libsigc: bump to version 3.0.7

Change license to LGPL-3.0+:
https://github.com/libsigcplusplus/libsigcplusplus/commit/8a231956bc0a8d9c5d0db59a3eaf4311ee36275f

https://github.com/libsigcplusplus/libsigcplusplus/blob/3.0.7/NEWS

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/libsigc/libsigc.hash

@@ -1,5 +1,5 @@
-# From http://ftp.gnome.org/pub/gnome/sources/libsigc++/2.10/libsigc++-2.10.6.sha256sum
-sha256  dda176dc4681bda9d5a2ac1bc55273bdd381662b7a6d49e918267d13e8774e1b  libsigc++-2.10.6.tar.xz
+# From http://ftp.gnome.org/pub/gnome/sources/libsigc++/3.0/libsigc++-3.0.7.sha256sum
+sha256  bfbe91c0d094ea6bbc6cbd3909b7d98c6561eea8b6d9c0c25add906a6e83d733  libsigc++-3.0.7.tar.xz
 
 # Locally calculated
-sha256  5bbcbb737e60fe9deba08ecbd00920cfcc3403ba2e534c64fdeea49d6bb87509  COPYING
+sha256  97628afebc60f026f5c2b25d7491c46a5c4ee61f693e7cfa07fbd2c03605979b  COPYING

package/libsigc/libsigc.mk

@@ -4,12 +4,12 @@
 #
 ################################################################################
 
-LIBSIGC_VERSION_MAJOR = 2.10
-LIBSIGC_VERSION = $(LIBSIGC_VERSION_MAJOR).6
+LIBSIGC_VERSION_MAJOR = 3.0
+LIBSIGC_VERSION = $(LIBSIGC_VERSION_MAJOR).7
 LIBSIGC_SOURCE = libsigc++-$(LIBSIGC_VERSION).tar.xz
 LIBSIGC_SITE = http://ftp.gnome.org/pub/GNOME/sources/libsigc++/$(LIBSIGC_VERSION_MAJOR)
 LIBSIGC_INSTALL_STAGING = YES
-LIBSIGC_LICENSE = LGPL-2.1+
+LIBSIGC_LICENSE = LGPL-3.0+
 LIBSIGC_LICENSE_FILES = COPYING
 LIBSIGC_CONF_OPTS = \
 	-Dbuild-examples=false \