On some build hosts openssl fails to install since openssl installs itself into
lib64 while the openwrt Makefile expects the libs to end up in lib.

install -m0644 .../openwrt/build_dir/target-x86_64_uClibc-0.9.33.2/openssl-1.0.1e/ipkg-install/usr/lib/libcrypto.so.* .../openwrt/build_dir/target-x86_64_uClibc-0.9.33.2/openssl-1.0.1e/ipkg-x86_64/libopenssl/usr/lib/
install: cannot stat '.../openwrt/build_dir/target-x86_64_uClibc-0.9.33.2/openssl-1.0.1e/ipkg-install/usr/lib/libcrypto.so.*': No such file or directory
make[2]: *** [/openwrt/bin/x86_64/packages/libopenssl_1.0.1e-2_x86_64.ipk] Error 1
make[2]: Leaving directory `/openwrt/package/libs/openssl'
make[1]: *** [package/libs/openssl/compile] Error 2
make[1]: Leaving directory `/openwrt'

Set LIBDIR accordingly to fix this.

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>

SVN-Revision: 39885