build: add code coverage to make

PR-URL: https://github.com/nodejs/node/pull/10856
Reviewed-By: Jeremiah Senkpiel <[email protected]>
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Michael Dawson <[email protected]>
diff --git a/node.gyp b/node.gyp
index 59d9326..0d5b6c2 100644
--- a/node.gyp
+++ b/node.gyp
@@ -94,6 +94,7 @@
       'lib/internal/process/warning.js',
       'lib/internal/process.js',
       'lib/internal/querystring.js',
+      'lib/internal/process/write-coverage.js',
       'lib/internal/readline.js',
       'lib/internal/repl.js',
       'lib/internal/socket_list.js',