Remove use of AC_REQUIRE which had been used to prevent AC_CANONICAL_HOST
from being called twice, since it gives recent autoconf programs
heartburn (and doesn't seem to be required anymore), anyway.

diff --git a/configure.in b/configure.in
index a9ad429..c9dc947 100644
--- a/configure.in
+++ b/configure.in
@@ -43,7 +43,7 @@
 AC_SUBST(E2FSPROGS_YEAR)
 AC_SUBST(E2FSPROGS_MONTH)
 AC_SUBST(E2FSPROGS_VERSION)
-AC_REQUIRE([AC_CANONICAL_HOST])
+AC_CANONICAL_HOST
 dnl
 dnl set $(CC) from --with-cc=value
 dnl