Master fails to build without ldap headers

Hi all

While doing some setup I've noticed that master (at least) appears to
fail to build if LDAP headers aren't installed.

gcc -O2 -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement -Wendif-labels
-Wmissing-format-attribute-Wformat-security -fno-strict-aliasing -fwrapv -I../../../src/include -D_GNU_SOURCE   -c -o
hba.ohba.c
 
hba.c: In function 'parse_hba_auth_opt':
hba.c:1388: error: 'LDAP_SCOPE_SUBTREE' undeclared (first use in this function)
hba.c:1388: error: (Each undeclared identifier is reported only once
hba.c:1388: error: for each function it appears in.)
hba.c:1451: error: 'LDAPURLDesc' undeclared (first use in this function)
hba.c:1451: error: 'urldata' undeclared (first use in this function)
hba.c:1452: warning: ISO C90 forbids mixed declarations and code
hba.c:1452: warning: unused variable 'rc'


It looks like this was broken by:

commit aa2fec0a18e4d23272c78916ef318078c920611a
Author: Peter Eisentraut <peter_e@gmx.net>
Date:   Mon Dec 3 23:29:56 2012 -0500
   Add support for LDAP URLs     Allow specifying LDAP authentication parameters as RFC 4516 LDAP URLs.



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