Fix AVR compilation of FNV by using standard integer typenames. (#17716)

lib/fnv/fnv.h

@@ -76,7 +76,8 @@
 #if !defined(__FNV_H__)
 #define __FNV_H__
 
-#include <sys/types.h>
+#include <stdlib.h>
+#include <stdint.h>
 
 #define FNV_VERSION "5.0.2"	/* @(#) FNV Version */
 
@@ -84,7 +85,7 @@
 /*
  * 32 bit FNV-0 hash type
  */
-typedef u_int32_t Fnv32_t;
+typedef uint32_t Fnv32_t;
 
 
 /*
@@ -122,10 +123,10 @@ typedef u_int32_t Fnv32_t;
  * 64 bit FNV-0 hash
  */
 #if defined(HAVE_64BIT_LONG_LONG)
-typedef u_int64_t Fnv64_t;
+typedef uint64_t Fnv64_t;
 #else /* HAVE_64BIT_LONG_LONG */
 typedef struct {
-    u_int32_t w32[2]; /* w32[0] is low order, w32[1] is high order word */
+    uint32_t w32[2]; /* w32[0] is low order, w32[1] is high order word */
 } Fnv64_t;
 #endif /* HAVE_64BIT_LONG_LONG */