package/localedef: relax required toolchain version

package/localedef: relax required toolchain version

The glibc package has been updating the toolchain version
dependency since 2.28.x. The dependencies don't currently
apply to the localedef build of the package, so this
patchset relaxes the restriction such that builds can still
occur on older host machines.

The current supported minimum versions after this patch
is applied are:
GCC 4.8
Binutils 2.24

Signed-off-by: Matthew Weber <matthew.weber@rockwellcollins.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>