build: drop stray ifndef guards for local/internal macros

For:
- lib/vtls: `MAX_PINNED_PUBKEY_SIZE`.
- src: `UNPRINTABLE_CHAR`.
- tests/server/tftpd: `PKTSIZE`.

Closes #20314

lib/vtls/vtls.h

@@ -93,9 +93,7 @@ struct ssl_peer {
 CURLsslset Curl_init_sslset_nolock(curl_sslbackend id, const char *name,
                                    const curl_ssl_backend ***avail);
 
-#ifndef MAX_PINNED_PUBKEY_SIZE
 #define MAX_PINNED_PUBKEY_SIZE 1048576 /* 1 MiB */
-#endif
 
 curl_sslbackend Curl_ssl_backend(void);
 

src/tool_setup.h

@@ -59,10 +59,8 @@ extern FILE *tool_stderr;
 #define CURL_OS "unknown"
 #endif
 
-#ifndef UNPRINTABLE_CHAR
 /* define what to use for unprintable characters */
 #define UNPRINTABLE_CHAR '.'
-#endif
 
 #ifndef HAVE_STRDUP
 #include "tool_strdup.h"

tests/server/tftpd.c

@@ -108,9 +108,7 @@ struct tftphdr {
  *                      STRUCT DECLARATIONS AND DEFINES                      *
  *****************************************************************************/
 
-#ifndef PKTSIZE
 #define PKTSIZE (SEGSIZE + 4)  /* SEGSIZE defined in arpa/tftp.h */
-#endif
 
 struct testcase {
   char *buffer;   /* holds the file data to send to the client */