gnulib: bump minimum supported autoconf version

f18079d0 · Raphaël Dias--Monteiro · 9ef339b6 · f18079d0
Commit f18079d0 authored Sep 11, 2020 by Raphaël Dias--Monteiro 🐅
--- a/configure.ac
+++ b/configure.ac
 ##
 ## Configure Nolimips: a MIPS emulator with unlimited registers.
 ##
- AC_PREREQ([2.63])
+ AC_PREREQ([2.64])


 ## Project -----------------------------