.jshintrc

remotefilelog: acquire lock before writing requirements on clone

Performing a shallow clone in remotefilelog does not acquire lock. This leads to
following warning when we try to write some requirements in store:

```
--- /home/gps/src/hg-committed/tests/test-remotefilelog-share.t
+++ /home/gps/src/hg-committed/tests/test-remotefilelog-share.t#safe.err
@@ -28,6 +28,7 @@


   $ hgcloneshallow ssh://user@dummy/master source --noupdate -q
+  devel-warn: write with no lock: "requires" at: /home/gps/src/hg-committed/mercurial/scmutil.py:1505 (writerequires)
   $ hg share source dest
   updating working directory
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
```

Let's lock before writing the requirements file.

Another solution which I can think of is not warn about missing lock when
writing to requires file in store.

Differential Revision: https://phab.mercurial-scm.org/D8952

{
    // Enforcing
    "eqeqeq"        : true,     // true: Require triple equals (===) for comparison
    "forin"         : true,     // true: Require filtering for..in loops with obj.hasOwnProperty()
    "freeze"        : true,     // true: prohibits overwriting prototypes of native objects such as Array, Date etc.
    "nonbsp"        : true,     // true: Prohibit "non-breaking whitespace" characters.
    "undef"         : true,     // true: Require all non-global variables to be declared (prevents global leaks)

    // Environments
    "browser"       : true      // Web Browser (window, document, etc)
}