deps,win: increase msvs_shard in gyp for V8

Increase the number of shards to divide v8_base into. This increases
the number of calls to cl.exe but decreases the number of files
compiled each time.

Fixes: nodejs/v8#4
PR-URL: #12184
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

deps/v8/src/v8.gyp

@@ -1803,7 +1803,7 @@
           # When building Official, the .lib is too large and exceeds the 2G
           # limit. This breaks it into multiple pieces to avoid the limit.
           # See http://crbug.com/485155.
-          'msvs_shard': 4,
+          'msvs_shard': 10,
         }],
         ['component=="shared_library"', {
           'defines': [