PHPC-1174: Fixed PECL package generation due to directory changes

Missed updating these paths in 7c0ccd3

Author: derickr

bin/prep-release.php

@@ -50,7 +50,7 @@ function get_files() {
         "src/libmongoc/src/libbson/src/bson/*.{c,h,h.in}",
         "src/libmongoc/src/libbson/src/jsonsl/*.{c,h}",
         "src/libmongoc/src/libbson/VERSION*",
-        "src/libmongoc/src/mongoc/*.{c,def,defs,h,h.in}",
+        "src/libmongoc/src/libmongoc/src/mongoc/*.{c,def,defs,h,h.in}",
         "src/libmongoc/src/zlib-1.2.11/*.{c,h,h.in}",
         "src/libmongoc/VERSION*",
       ),