net/nss_ldap: Fix LLVM15 build

./configure's test for Heimdal results in,

conftest.c:47:12: error: incompatible pointer to integer conversion initializing
 'const char' with an expression of type 'const char *'; dereference with * [-Wi
nt-conversion]
const char hv = heimdal_version;
           ^    ~~~~~~~~~~~~~~~
                *

This causes ./configure to erroneously assume 14-CURRENT uses MIT instead
of Heimdal, resulting in a subsequent build failure because MIT's
<profile.h> cannot be found.

MFH:		2023Q3

net/nss_ldap/files/patch-configure.in

@@ -1,5 +1,5 @@
---- configure.in.orig
-+++ configure.in
+--- configure.in.orig	2009-11-06 02:28:08.000000000 -0800
++++ configure.in	2023-05-09 21:54:34.360457000 -0700
 @@ -97,11 +97,15 @@
  linux*) nss_ldap_so_LDFLAGS="-shared -Wl,-Bdynamic -Wl,--version-script,\$(srcdir)/exports.linux" ;;
  *) nss_ldap_so_LDFLAGS="-shared -Wl,-Bdynamic" ;;
@@ -24,21 +24,22 @@
       AC_CHECK_HEADERS(irs.h) ;;
  esac
  AC_CHECK_HEADERS(thread.h)
-@@ -188,6 +191,13 @@
+@@ -188,6 +191,14 @@
  AC_CHECK_HEADERS(gssapi/gssapi_krb5.h gssapi.h)
  AC_CHECK_HEADERS(krb5.h)
 
 +AC_MSG_CHECKING([if Kerberos is Heimdal])
 +AC_TRY_LINK([#include <krb5.h>],
-+	    [const char hv = heimdal_version;],
++	    [char hv = heimdal_version;],
++	    [hv = hv;],
 +	    [AC_MSG_RESULT(yes)
 +	     AC_DEFINE(HEIMDAL,1,[Define if Kerberos is Heimdal])],
 +	    [AC_MSG_RESULT(no)])
 +
  AC_CHECK_LIB(resolv, main)
  AC_CHECK_LIB(nsl, main)
  AC_CHECK_LIB(socket, main)
-@@ -230,7 +240,6 @@
+@@ -230,7 +241,6 @@
  AC_CHECK_FUNCS(gethostbyname)
  AC_CHECK_FUNCS(nsdispatch)
  AC_CHECK_LIB(pthread_nonshared, main)