Don't use malloc.h header on OpenBSD.

Index: lgrind.c
--- lgrind.c.orig
+++ lgrind.c
@@ -94,7 +94,6 @@ static char rcsid[] =
 #include <stdlib.h>
 #include <ctype.h>
 #include <string.h>
-#include <malloc.h>
 #include <time.h>
 /* One of the following two (depending on your system) */
 #include <unistd.h>
@@ -516,7 +515,8 @@ int main(int argc, char **argv)
 		 printf("\\File{");
 		 putstr(fname);
 		 printf("}{%d}{%d}{%d}{%d:%02d}{%ld}\n", modtime.tm_year+1900, modtime.tm_mon+1,
-				 modtime.tm_mday, modtime.tm_hour, modtime.tm_min, stbuf.st_size);
+				 modtime.tm_mday, modtime.tm_hour, modtime.tm_min,
+				 (long)stbuf.st_size);
       }
 
       code = FALSE;
@@ -1383,7 +1383,7 @@ boolean putKcp(char *start, char *end, boolean nix)
       /*
        * First split off numbers.  We have a rather ad hoc
        * definition:  A number is a digit followed by any number
-       * of digits or letters, and periods.
+       * of hex digits, and periods.
        * (Additionally a number can start with %|$|% (e.g. hex numbers).)
        * This produces meaningless parses --- %$.2$% is parsed as %|.|%
        * followed by the number %|2|% --- but should produce decent
@@ -1413,7 +1413,7 @@ boolean putKcp(char *start, char *end, boolean nix)
 		       else
 				  outchar(c);
 		       c = *start++;
-		    } while (isalnum(c) || (c == '.' && *start != '.'));
+		    } while (isxdigit(c) || (c == '.' && *start != '.'));
 		    putchar('}');
 		    start--;
 		    continue;