remove no longer existing option

apache-php/apache-php.spec

@@ -32,7 +32,7 @@ Class:        BASE
 Group:        Web
 License:      PHP
 Version:      7.4.0
-Release:      20191128
+Release:      20191201
 
 #   package options
 %option       with_bc                   no
@@ -499,7 +499,6 @@ PreReq:       gmp
 %if "%{with_simplexml}" == "yes"
         --enable-simplexml \
         --with-libxml \
-        --with-libxml-dir=%{l_prefix} \
 %else
         --disable-simplexml \
 %endif