libreadline: add host-build

Also make sure that the PKG_NAME and folder name are equal.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

package/libs/readline/patches/001-install_perm.patch

@@ -0,0 +1,11 @@
+--- a/support/shlib-install
++++ b/support/shlib-install
+@@ -73,7 +73,7 @@ fi
+ case "$host_os" in
+ hpux*|darwin*|macosx*|linux*|solaris2*)
+ 	if [ -z "$uninstall" ]; then
+-		chmod 555 ${INSTALLDIR}/${LIBNAME}
++		chmod +x ${INSTALLDIR}/${LIBNAME}
+ 	fi ;;
+ cygwin*|mingw*)
+ 	IMPLIBNAME=`echo ${LIBNAME} \