Add emulation of access() (in terms of fopen()!). I *think* Windows

doesn't already have one.

src/winjunk.c

@@ -63,4 +63,12 @@ double rint(double v) {
     return floor(v + 0.5);
 }
 
+int access(char *fname, int how) {
+    FILE *f;
+    if(fname == NULL || (f = fopen(fname, "r")) == NULL)
+	return -1;
+    fclose(f);
+    return 0;
+}
+
 #endif /*WIN32*/

src/winjunk.h

@@ -18,4 +18,7 @@ extern int random();
 
 extern double rint(double);
 
+extern int access(char *fname, int how);
+#define R_OK 004
+
 #endif /*WIN32*/