Rename nodeChildProcess to child_process per reviewer feedback

Author: Bartek Wrona

src/lib/libcore.js

@@ -374,8 +374,8 @@ addToLibrary({
 
 #if ENVIRONMENT_MAY_BE_NODE
   $nodeOs: "{{{ makeNodeImport('node:os') }}}",
-  $nodeChildProcess: "{{{ makeNodeImport('node:child_process') }}}",
-  _emscripten_system__deps: ['$nodeChildProcess'],
+  $child_process: "{{{ makeNodeImport('node:child_process') }}}",
+  _emscripten_system__deps: ['$child_process'],
 #endif
   _emscripten_system: (command) => {
 #if ENVIRONMENT_MAY_BE_NODE
@@ -385,7 +385,7 @@ addToLibrary({
       var cmdstr = UTF8ToString(command);
       if (!cmdstr.length) return 0; // this is what glibc seems to do (shell works test?)
 
-      var ret = nodeChildProcess.spawnSync(cmdstr, [], {shell:true, stdio:'inherit'});
+      var ret = child_process.spawnSync(cmdstr, [], {shell:true, stdio:'inherit'});
 
       var _W_EXITCODE = (ret, sig) => ((ret) << 8 | (sig));