[toolchain/gcc]: llvm is marked broken for two and a half year now, nuke it

git-svn-id: svn://svn.openwrt.org/openwrt@36145 3c298f89-4303-0410-b956-a3cf2f4a3e73
[toolchain/gcc]: fixup 4.7 configure options

git-svn-id: svn://svn.openwrt.org/openwrt@36146 3c298f89-4303-0410-b956-a3cf2f4a3e73
[toolchain/gcc]: remove empty 4.6.2 patches directory

git-svn-id: svn://svn.openwrt.org/openwrt@36147 3c298f89-4303-0410-b956-a3cf2f4a3e73
[toolchain/gcc]: cleanup

git-svn-id: svn://svn.openwrt.org/openwrt@36148 3c298f89-4303-0410-b956-a3cf2f4a3e73
[toolchain/gcc]: drop 4.5 support

git-svn-id: svn://svn.openwrt.org/openwrt@36149 3c298f89-4303-0410-b956-a3cf2f4a3e73