[packages] libsigc++: update to 2.2.8 (#8276), thanks sav, use PKG_INSTALL and refresh patches

git-svn-id: svn://svn.openwrt.org/openwrt/packages@24635 3c298f89-4303-0410-b956-a3cf2f4a3e73

libs/libsigc++/patches/001-no_doc_tests_examples.patch

@@ -1,7 +1,6 @@
-diff -urN libsigc++-2.2.3/Makefile.am libsigc++-2.2.3.new/Makefile.am
---- a/Makefile.am	2009-08-20 14:32:40.000000000 +0400
-+++ b/Makefile.am	2009-11-13 10:26:01.000000000 +0300
-@@ -22,7 +22,7 @@
+--- a/Makefile.am
++++ b/Makefile.am
+@@ -22,7 +22,7 @@ doc_subdirs = docs
  else
  doc_subdirs =
  endif
@@ -10,11 +9,10 @@ diff -urN libsigc++-2.2.3/Makefile.am libsigc++-2.2.3.new/Makefile.am
  
  sigc_configdir = $(libdir)/$(SIGCXX_MODULE_NAME)/include
  nodist_sigc_config_HEADERS = sigc++config.h
-diff -urN libsigc++-2.2.3/Makefile.in libsigc++-2.2.3.new/Makefile.in
---- a/Makefile.in	2009-09-02 19:55:19.000000000 +0400
-+++ b/Makefile.in	2009-11-13 10:29:43.000000000 +0300
-@@ -89,7 +89,7 @@
-   distclean-recursive maintainer-clean-recursive
+--- a/Makefile.in
++++ b/Makefile.in
+@@ -114,7 +114,7 @@ AM_RECURSIVE_TARGETS = $(RECURSIVE_TARGE
+ 	distdir dist dist-all distcheck
  ETAGS = etags
  CTAGS = ctags
 -DIST_SUBDIRS = sigc++ tests examples docs