maint: port to gcc -std=c99 -Wstrict-prototypes

This doesn’t fix any bugs, since the code is correct as-is on all
C versions.  However, it pacifies gcc -std=c99 -Wstrict-prototypes,
which complains about a function definition without arguments
unless there’s a previous prototype with ‘(void)’.
Most (but not all) of this patch merely reverts some recent
changes to be more consistent when porting to C23.
* dfltcc.c (is_dfltcc_enabled):
* gzip.c (get_input_size_and_time):
* inflate.c (inflate_stored, inflate_fixed, inflate_dynamic):
* unpack.c (read_byte):

1 files changed, 3 insertions, 3 deletions

diff --git a/inflate.c b/inflate.c
index f90cab5..e92bc6c 100644
--- a/inflate.c
+++ b/inflate.c
@@ -627,7 +627,7 @@ inflate_codes(struct huft *tl, struct huft *td, int bl, int bd)
 
 /* "decompress" an inflated type 0 (stored) block. */
 static int
-inflate_stored ()
+inflate_stored(void)
 {
   unsigned n;           /* number of bytes in block */
   unsigned w;           /* current window position */
@@ -683,7 +683,7 @@ inflate_stored ()
    either replace this with a custom decoder, or at least precompute the
    Huffman tables. */
 static int
-inflate_fixed ()
+inflate_fixed(void)
 {
   int i;                /* temporary variable */
   struct huft *tl;      /* literal/length code table */
@@ -733,7 +733,7 @@ inflate_fixed ()
 
 /* decompress an inflated type 2 (dynamic Huffman codes) block. */
 static int
-inflate_dynamic ()
+inflate_dynamic(void)
 {
   int i;                /* temporary variables */
   unsigned j;