libldb: allow chosing ldap dependency instead of hard requiring it

Add a patch to remove the check for openldap but mark prove result negative unless
ldap dependency is enabled explicitely.

Signed-off-by: Jens Rehsack <sno@netbsd.org>
Signed-off-by: Joe MacDonald <joe_macdonald@mentor.com>

meta-networking/recipes-support/libldb/libldb/avoid-openldap-unless-wanted.patch

@@ -0,0 +1,13 @@
+--- a/wscript	2015-11-18 12:43:33.000000000 +0100
++++ b/wscript	2015-11-18 12:46:25.000000000 +0100
+@@ -58,9 +58,7 @@
+     if conf.env.standalone_ldb:
+         conf.CHECK_XSLTPROC_MANPAGES()
+ 
+-        # we need this for the ldap backend
+-        if conf.CHECK_FUNCS_IN('ber_flush ldap_open ldap_initialize', 'lber ldap', headers='lber.h ldap.h'):
+-            conf.env.ENABLE_LDAP_BACKEND = True
++        conf.env.ENABLE_LDAP_BACKEND = False
+ 
+         # we don't want any libraries or modules to rely on runtime
+         # resolution of symbols

meta-networking/recipes-support/libldb/libldb_1.1.17.bb

@@ -3,14 +3,16 @@ HOMEPAGE = "http://ldb.samba.org"
 SECTION = "libs"
 LICENSE = "LGPL-3.0+ & LGPL-2.1+ & GPL-3.0+"
 
-DEPENDS += "libtdb libtalloc libtevent popt"
-RDEPENDS_${PN} += "openldap"
+DEPENDS += "libbsd libtdb libtalloc libtevent popt"
 RDEPENDS_pyldb += "python"
 
 SRC_URI = "http://samba.org/ftp/ldb/ldb-${PV}.tar.gz \
            file://do-not-import-target-module-while-cross-compile.patch \
           "
 
+PACKAGECONFIG[ldap] = ",,openldap"
+SRC_URI += "${@bb.utils.contains('PACKAGECONFIG', 'ldap', '', 'file://avoid-openldap-unless-wanted.patch', d)}"
+
 LIC_FILES_CHKSUM = "file://${COREBASE}/meta/files/common-licenses/LGPL-3.0;md5=bfccfe952269fff2b407dd11f2f3083b \
                     file://${COREBASE}/meta/files/common-licenses/LGPL-2.1;md5=1a6d268fd218675ffea8be556788b780 \
                     file://${COREBASE}/meta/files/common-licenses/GPL-3.0;md5=c79ff39f19dfec6d293b95dea7b07891"