patch 9.1.0544: filetype: ldapconf files are not recognized

Problem:  filetype: ldapconf files are not recognized
Solution: Detect '.ldaprc', 'ldap.conf' and 'ldaprc' files as ldapconf
          filetype, include a simple ldapconf ftplugin file
          (Riley Bruins)

[Specification](https://www.openldap.org/software//man.cgi?query=ldap.conf&sektion=5&apropos=0&manpath=OpenLDAP+2.4-Release)

closes: #15176

Signed-off-by: Riley Bruins <ribru17@hotmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index d6491be..2a9e6b4 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -385,6 +385,7 @@
     lace: ['file.ace', 'file.ACE'],
     latte: ['file.latte', 'file.lte'],
     ld: ['file.ld', 'any/usr/lib/aarch64-xilinx-linux/ldscripts/aarch64elf32b.x'],
+    ldapconf: ['ldap.conf', '.ldaprc', 'ldaprc'],
     ldif: ['file.ldif'],
     lean: ['file.lean'],
     ledger: ['file.ldg', 'file.ledger', 'file.journal'],
diff --git a/src/version.c b/src/version.c
index 6f7c2c0..536f840 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    544,
+/**/
     543,
 /**/
     542,