e1_input.h: add missing extern for value string arrays

Mark two value string arrays as extern, so symbols aren't created for
each source file that includes the headers.

Tweaked-by: nhofmeyr (commit log)
Signed-off-by: Arran Cudbard-Bell <a.cudbardb@freeradius.org>
Change-Id: Iebf4b3922a48ca2cc20d478aba06224dd89d38cb
1 file changed