component/openldap: Use openssl == 1.0

Since default openssl component is 1.1 and is not compatible with this
component, use openssl-1.0.

component/openldap/buildout.cfg

@@ -24,6 +24,6 @@ configure-options =
   --with-tls=openssl
 
 environment =
-  CPPFLAGS=-I${openssl:location}/include -I${cyrus-sasl:location}/include
-  LDFLAGS=-L${openssl:location}/lib -Wl,-rpath=${openssl:location}/lib -L${cyrus-sasl:location}/lib -Wl,-rpath=${cyrus-sasl:location}/lib
+  CPPFLAGS=-I${openssl-1.0:location}/include -I${cyrus-sasl:location}/include
+  LDFLAGS=-L${openssl-1.0:location}/lib -Wl,-rpath=${openssl-1.0:location}/lib -L${cyrus-sasl:location}/lib -Wl,-rpath=${cyrus-sasl:location}/lib
   PATH=${groff:location}/bin:%(PATH)s