shl: add u64 htable helpers

Add u64 helpers to shl_htable. They're fairly trivial and just copied from
unsigned-long, however, in case size_t is not 64bit wide we need to do
some trivial hashing.

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>

src/shared/shl_htable.c

@@ -18,9 +18,9 @@
 
 #include <assert.h>
 #include <errno.h>
+#include <inttypes.h>
 #include <limits.h>
 #include <stdbool.h>
-#include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 #include "shl_htable.h"
@@ -443,6 +443,16 @@ size_t shl_htable_rehash_ulong(const void *elem, void *priv)
 	return (size_t)*(const unsigned long*)elem;
 }
 
+bool shl_htable_compare_u64(const void *a, const void *b)
+{
+	return *(const uint64_t*)a == *(const uint64_t*)b;
+}
+
+size_t shl_htable_rehash_u64(const void *elem, void *priv)
+{
+	return shl__htable_rehash_u64((const uint64_t*)elem);
+}
+
 bool shl_htable_compare_str(const void *a, const void *b)
 {
 	if (!*(char**)a || !*(char**)b)