dtdocbook: remove register keyword

cde/programs/dtdocbook/sgmls/getopt.c

@@ -58,8 +58,8 @@ char *opts;
 	static char switchar = '\0';
 #endif
 	static int sp = 1;
-	register int c;
-	register char *cp;
+	int c;
+	char *cp;
 	char *message;
 #ifdef SWITCHAR
 	if (switchar == '\0') {

cde/programs/dtdocbook/sgmls/pars1.c

@@ -923,9 +923,9 @@ int etag()
 */
 VOID destack()
 {
-     register int ecode = 0;  /* Error code (0=o.k.). */
+     int ecode = 0;  /* Error code (0=o.k.). */
      UNCH *eparm2 = NULL;     /* Second parameter of error message. */
-     register int minmsgsw;   /* 1=message if tag omitted; 0=no message. */
+     int minmsgsw;   /* 1=message if tag omitted; 0=no message. */
 
      /* If element has a content model (i.e., not a keyword) and there
         are required tags left, and no CONREF attribute was specified,