autofs-5.1.8 - add missing include to hash.h for _WORDSIZE

From: Sam James <sam@gentoo.org>

Fixes build failure on musl like:
```
../include/hash.h:22:2: error: #error Wordsize not 32 or 64
   22 | #error Wordsize not 32 or 64
      |  ^~~~~
```

Tested-by: Yixun Lan <dlan@gentoo.org>
Signed-off-by: Sam James <sam@gentoo.org>
---
 CHANGELOG      |    1 +
 include/hash.h |    5 +++++
 2 files changed, 6 insertions(+)

diff --git a/CHANGELOG b/CHANGELOG
index 98c8da8d..02f8ef5f 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -21,6 +21,7 @@
 - musl: fix missing include in hash.h.
 - musl: define fallback dummy NSS config path
 - musl: avoid internal stat.h definitions.
+- musl: add missing include to hash.h for _WORDSIZE.
 
 19/10/2021 autofs-5.1.8
 - add xdr_exports().
diff --git a/include/hash.h b/include/hash.h
index 010acd7e..0f1d7b5d 100644
--- a/include/hash.h
+++ b/include/hash.h
@@ -3,6 +3,11 @@
 /* Fast hashing routine for ints,  longs and pointers.
    (C) 2002 Nadia Yvette Chambers, IBM */
 
+#ifdef __GLIBC__
+#include <bits/wordsize.h>
+#else
+#include <bits/reg.h>
+#endif
 #include <linux/stddef.h>
 #include <sys/types.h>
 #include <stdint.h>