change internal.h to util.h

tool/Makefile.am

@@ -39,7 +39,7 @@ noinst_LTLIBRARIES = libpiv_cmd.la libpiv_util.la
 libpiv_cmd_la_SOURCES = cmdline.ggo cmdline.c cmdline.h
 libpiv_cmd_la_CFLAGS =
 
-libpiv_util_la_SOURCES = util.c internal.h
+libpiv_util_la_SOURCES = util.c util.h
 
 cmdline.c cmdline.h: cmdline.ggo Makefile.am
 	$(GENGETOPT) --input $^

tool/util.c

@@ -41,7 +41,7 @@
 #include <ykpiv.h>
 
 #include "cmdline.h"
-#include "internal.h"
+#include "util.h"
 
 FILE *open_file(const char *file_name, int mode) {
   FILE *file;

tool/yubico-piv-tool.c

@@ -44,7 +44,7 @@
 #include <openssl/rand.h>
 
 #include "cmdline.h"
-#include "internal.h"
+#include "util.h"
 
 /* FASC-N containing S9999F9999F999999F0F1F0000000000300001E encoded in
  * 4-bit BCD with 1 bit parity. run through the tools/fasc.pl script to get