socat: moved to github

git-svn-id: svn://svn.openwrt.org/openwrt/packages@42155 3c298f89-4303-0410-b956-a3cf2f4a3e73
gcc: moved to github

git-svn-id: svn://svn.openwrt.org/openwrt/packages@42156 3c298f89-4303-0410-b956-a3cf2f4a3e73
picocom: moved to github

git-svn-id: svn://svn.openwrt.org/openwrt/packages@42157 3c298f89-4303-0410-b956-a3cf2f4a3e73