toolchain: remove another bogus copy of libiberty.a

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

Backport of r42624

git-svn-id: svn://svn.openwrt.org/openwrt/branches/barrier_breaker@42625 3c298f89-4303-0410-b956-a3cf2f4a3e73
Change the URL of oldpackages's repository
Update nspr and nss to config file
Update TP-LINK TL-WR740N[D] configuration
Update .gitignore
Add GCC Linaro 4.9 to toolchain
Remove .config_TP-LINK_TL-WR740N[D]
Update .gitignore