basic|boot: silence Wunterminated-string-initialization gcc15 warnings

gcc15 has -Wunterminated-string-initialization in -Wextra and
warns about string constants that are not null terminated even though
the functions do do out of bounds access.
Silence the warnings by simply not providing an explicit size.

(cherry picked from commit af1a6db)
(cherry picked from commit ca09bc3)
(cherry picked from commit f6f0d85)
(cherry picked from commit e49ce1b)

Author: crrodriguez

src/basic/hexdecoct.c

@@ -36,7 +36,7 @@ int undecchar(char c) {
 }
 
 char hexchar(int x) {
-        static const char table[16] = "0123456789abcdef";
+        static const char table[] = "0123456789abcdef";
 
         return table[x & 15];
 }
@@ -168,8 +168,8 @@ int unhexmem_full(
  * useful when representing NSEC3 hashes, as one can then verify the
  * order of hashes directly from their representation. */
 char base32hexchar(int x) {
-        static const char table[32] = "0123456789"
-                                      "ABCDEFGHIJKLMNOPQRSTUV";
+        static const char table[] = "0123456789"
+                                    "ABCDEFGHIJKLMNOPQRSTUV";
 
         return table[x & 31];
 }
@@ -519,19 +519,19 @@ int unbase32hexmem(const char *p, size_t l, bool padding, void **mem, size_t *_l
 
 /* https://tools.ietf.org/html/rfc4648#section-4 */
 char base64char(int x) {
-        static const char table[64] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
-                                      "abcdefghijklmnopqrstuvwxyz"
-                                      "0123456789+/";
+        static const char table[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+                                    "abcdefghijklmnopqrstuvwxyz"
+                                    "0123456789+/";
         return table[x & 63];
 }
 
 /* This is almost base64char(), but not entirely, as it uses the "url and filename safe" alphabet,
  * since we don't want "/" appear in interface names (since interfaces appear in sysfs as filenames).
  * See section #5 of RFC 4648. */
 char urlsafe_base64char(int x) {
-        static const char table[64] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
-                                      "abcdefghijklmnopqrstuvwxyz"
-                                      "0123456789-_";
+        static const char table[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+                                    "abcdefghijklmnopqrstuvwxyz"
+                                    "0123456789-_";
         return table[x & 63];
 }