configure: Fix error message for Kerberos versions with suffixes

[Ben Hutchings <ben@decadent.org.uk>]

Justin Pryzby reported (some time ago) that the following error message
appeared while configuring nfs-utils:

checking for Kerberos v5... ./configure: line 23606: test: 163-beta1-debian: integer expression expected
/usr
The current KRBDIR is /usr

This is because the Kerberos version check assumes that all version
components are separated by dots.  Change it to accept hyphens as
separators as well.

Reported-by: Justin Pryzby <justinpryzby@users.sourceforge.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
--- a/aclocal/kerberos5.m4
+++ b/aclocal/kerberos5.m4
@@ -32,7 +32,7 @@
     if test "$K5CONFIG" != ""; then
       KRBCFLAGS=`$K5CONFIG --cflags`
       KRBLIBS=`$K5CONFIG --libs gssapi`
-      K5VERS=`$K5CONFIG --version | head -n 1 | awk '{split($(4),v,"."); if (v@<:@"3"@:>@ == "") v@<:@"3"@:>@ = "0"; print v@<:@"1"@:>@v@<:@"2"@:>@v@<:@"3"@:>@ }'`
+      K5VERS=`$K5CONFIG --version | head -n 1 | awk '{split($(4),v,/@<:@.-@:>@/); if (v@<:@"3"@:>@ == "") v@<:@"3"@:>@ = "0"; print v@<:@"1"@:>@v@<:@"2"@:>@v@<:@"3"@:>@ }'`
       AC_DEFINE_UNQUOTED(KRB5_VERSION, $K5VERS, [Define this as the Kerberos version number])
       if test -f $dir/include/gssapi/gssapi_krb5.h -a \
                 \( -f $dir/lib/libgssapi_krb5.a -o \
---

-- 
Ben Hutchings
Once a job is fouled up, anything done to improve it makes it worse.