strcasestr is not portable. Add a local copy.

ldapdiff/ldapdiff.spec

@@ -33,10 +33,11 @@ Class:        PLUS
 Group:        Database
 License:      GPL
 Version:      1.2.1
-Release:      20051119
+Release:      20060311
 
 #   list of sources
 Source0:      http://webtomware.rhoen.de/ldapdiff-%{version}.tar.gz
+Patch0:       ldapdiff.patch
 
 #   build information
 Prefix:       %{l_prefix}
@@ -62,6 +63,7 @@ AutoReqProv:  no
 
 %prep
     %setup -q
+    %patch -p0
 
 %build
     CC="%{l_cc}" \