adding protection for the flex files. also added ompi_config.h for them

This commit was SVN r3337.

src/mca/base/mca_base_parse_paramfile_lex.l

@@ -1,7 +1,10 @@
 %{ /* -*- C -*- */
+#include "ompi_config.h"
 
 #include <stdio.h>
+#if HAVE_UNISTD_H
 #include <unistd.h>
+#endif
 
 #include "mca/base/mca_base_parse_paramfile_lex.h"
 

src/mca/llm/base/llm_base_parse_hostfile_lex.l

@@ -1,7 +1,10 @@
 %{ /* -*- C -*- */
+#include "ompi_config.h"
 
 #include <stdio.h>
+#if HAVE_UNISTD_H
 #include <unistd.h>
+#endif
 
 #include "mca/llm/base/llm_base_parse_hostfile_lex.h"
 

src/util/show_help_lex.l

@@ -3,7 +3,9 @@
 #include "ompi_config.h"
 
 #include <stdio.h>
+#if HAVE_UNISTD_H
 #include <unistd.h>
+#endif
 
 #include "util/show_help_lex.h"