[evolution] eds-I#99 - Fails to build against git master of OpenLDAP (vendor version check)

[Milan Crha <mcrha src gnome org>]

commit 4569f310428c32948679301046026856b5da2958
Author: Дилян Палаузов <dilyan palauzov aegee org>
Date:   Fri Apr 12 12:37:39 2019 +0200

    eds-I#99 - Fails to build against git master of OpenLDAP (vendor version check)
    
    Related to https://gitlab.gnome.org/GNOME/evolution-data-server/issues/99

 cmake/modules/FindLDAP.cmake | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/cmake/modules/FindLDAP.cmake b/cmake/modules/FindLDAP.cmake
index abbc3280d7..a98bbba76e 100644
--- a/cmake/modules/FindLDAP.cmake
+++ b/cmake/modules/FindLDAP.cmake
@@ -86,7 +86,8 @@ set(CMAKE_REQUIRED_LIBRARIES "${LDAP_LIBS}")
 if(WITH_OPENLDAP)
        CHECK_C_SOURCE_COMPILES("#include \"ldap.h\"
                                int main(void) {
-                                       #if !defined(LDAP_VENDOR_VERSION) || LDAP_VENDOR_VERSION < 20000
+                                       /* LDAP_VENDOR_VERSION is 0 if OpenLDAP is built from git/master */
+                                       #if !defined(LDAP_VENDOR_VERSION) || (LDAP_VENDOR_VERSION != 0 && 
LDAP_VENDOR_VERSION < 20000)
                                        #error OpenLDAP version not at least 2.0
                                        #endif
                                        return 0; }" openldap_2_x)