Added extra files to Makefile.am and fixed spelling errors.

Makefile.am

@@ -791,6 +791,7 @@ php_EXTRA_DIST=                                                       \
   php/ext/google/protobuf/wkt.inc                                     \
   php/generate_descriptor_protos.sh                                   \
   php/phpunit.xml                                                     \
+  php/prepare_c_extension.sh                                          \
   php/release.sh                                                      \
   php/src/GPBMetadata/Google/Protobuf/Any.php                         \
   php/src/GPBMetadata/Google/Protobuf/Api.php                         \
@@ -1391,6 +1392,8 @@ EXTRA_DIST = $(@DIST_LANG@_EXTRA_DIST)   \
   python/release/wheel/README.md         \
   third_party/six.BUILD                  \
   third_party/zlib.BUILD                 \
+  third_party/wyhash/LICENSE             \
+  third_party/wyhash/wyhash.h            \
   util/python/BUILD
 
 

php/ext/google/protobuf/php-upb.h

@@ -182,7 +182,7 @@ void __asan_unpoison_memory_region(void const volatile *addr, size_t size);
 ** store pointers or integers of at least 32 bits (upb isn't really useful on
 ** systems where sizeof(void*) < 4).
 **
-** The table must be homogenous (all values of the same type).  In debug
+** The table must be homogeneous (all values of the same type).  In debug
 ** mode, we check this on insert and lookup.
 */
 
@@ -3925,7 +3925,7 @@ extern "C" {
 #endif
 
 enum {
-  /* When set, emits 0/default values.  TOOD(haberman): proto3 only? */
+  /* When set, emits 0/default values.  TODO(haberman): proto3 only? */
   UPB_JSONENC_EMITDEFAULTS = 1,
 
   /* When set, use normal (snake_caes) field names instead of JSON (camelCase)