util: mark externally-unused functions as static

These functions aren't used outside of sha1.c, so let's remove the
prototypes from the header-file, and mark the definitions as static.

Reviewed-by: David Heidelberg <david.heidelberg@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/23163>

src/util/sha1/sha1.c

@@ -51,7 +51,7 @@ typedef union {
 /*
  * Hash a single 512-bit block. This is the core of the algorithm.
  */
-void
+static void
 SHA1Transform(uint32_t state[5], const uint8_t buffer[SHA1_BLOCK_LENGTH])
 {
 	uint32_t a, b, c, d, e;
@@ -144,7 +144,7 @@ SHA1Update(SHA1_CTX *context, const uint8_t *data, size_t len)
 /*
  * Add padding and return the message digest.
  */
-void
+static void
 SHA1Pad(SHA1_CTX *context)
 {
 	uint8_t finalcount[8];

src/util/sha1/sha1.h

@@ -27,8 +27,6 @@ typedef struct _SHA1_CTX {
 } SHA1_CTX;
 
 void SHA1Init(SHA1_CTX *);
-void SHA1Pad(SHA1_CTX *);
-void SHA1Transform(uint32_t [5], const uint8_t [SHA1_BLOCK_LENGTH]);
 void SHA1Update(SHA1_CTX *, const uint8_t *, size_t);
 void SHA1Final(uint8_t [SHA1_DIGEST_LENGTH], SHA1_CTX *);