net/nss_ldap: fix the build on both 13.2 and 14.0+

The original configure script attempted to detect the presence of
Heimdal, but it failed with LLVM 15+ due to a type casting bug.
commit 515552b2d2 fixed the bug with
LLVM 15+, but inadvertently broke the build for earlier versions.

This commit corrects the configure syntax, fixing the build on 12.4 and
13.2.

PR:		270465
Approved by:	mikael (ports)
Sponsored by:	Axcient
MFH:		2023Q4

net/nss_ldap/files/patch-configure.in

@@ -1,6 +1,6 @@
---- 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 @@
+--- configure.in.orig	2009-11-06 10:28:08 UTC
++++ configure.in
+@@ -97,11 +97,15 @@ esac
  linux*) nss_ldap_so_LDFLAGS="-shared -Wl,-Bdynamic -Wl,--version-script,\$(srcdir)/exports.linux" ;;
  *) nss_ldap_so_LDFLAGS="-shared -Wl,-Bdynamic" ;;
  esac
@@ -16,7 +16,7 @@
  
  AM_CONDITIONAL(USE_NATIVE_LINKER, test -n "$nss_ldap_so_LD")
  
-@@ -153,7 +157,6 @@
+@@ -153,7 +157,6 @@ case "$target_os" in
    aix*) AC_CHECK_HEADERS(irs.h usersec.h) ;;
    hpux*) AC_CHECK_HEADERS(nsswitch.h) ;;
    *) AC_CHECK_HEADERS(nss.h)
@@ -24,14 +24,13 @@
       AC_CHECK_HEADERS(irs.h) ;;
  esac
  AC_CHECK_HEADERS(thread.h)
-@@ -188,6 +191,14 @@
+@@ -188,6 +191,13 @@ AC_CHECK_HEADERS(krb5.h)
  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>],
-+	    [char hv = heimdal_version;],
-+	    [hv = hv;],
++	    [const char *hv = heimdal_version;],
 +	    [AC_MSG_RESULT(yes)
 +	     AC_DEFINE(HEIMDAL,1,[Define if Kerberos is Heimdal])],
 +	    [AC_MSG_RESULT(no)])
@@ -39,7 +38,7 @@
  AC_CHECK_LIB(resolv, main)
  AC_CHECK_LIB(nsl, main)
  AC_CHECK_LIB(socket, main)
-@@ -230,7 +241,6 @@
+@@ -230,7 +240,6 @@ AC_CHECK_LIB(pthread_nonshared, main)
  AC_CHECK_FUNCS(gethostbyname)
  AC_CHECK_FUNCS(nsdispatch)
  AC_CHECK_LIB(pthread_nonshared, main)