deps: cherry-pick c5c570f from upstream V8

Original commit message:

    [build] Fix gyp files for building inspector

    This patch fixes compilation of V8 with inspector on Windows as well as
    cross-compilation of the V8 inspector.

    BUG=

    Refs: https://github.com/nodejs/node/pull/10992
    Review-Url: https://codereview.chromium.org/2705423003
    Cr-Commit-Position: refs/heads/master@{#43533}

PR-URL: https://github.com/nodejs/node/pull/11752
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>

deps/v8/gypfiles/toolchain.gypi

@@ -989,8 +989,6 @@
         #       present in VS 2003 and earlier.
         'msvs_disabled_warnings': [4351],
         'msvs_configuration_attributes': {
-          'OutputDirectory': '<(DEPTH)\\build\\$(ConfigurationName)',
-          'IntermediateDirectory': '$(OutDir)\\obj\\$(ProjectName)',
           'CharacterSet': '1',
         },
       }],

deps/v8/src/inspector/inspector.gyp

@@ -13,6 +13,13 @@
   'targets': [
     { 'target_name': 'inspector_injected_script',
       'type': 'none',
+      'conditions': [
+        ['want_separate_host_toolset==1', {
+          'toolsets': ['host', 'target'],
+        }, {
+          'toolsets': ['target'],
+        }]
+      ],
       'actions': [
         {
           'action_name': 'convert_js_to_cpp_char_array',
@@ -37,6 +44,13 @@
     },
     { 'target_name': 'inspector_debugger_script',
       'type': 'none',
+      'conditions': [
+        ['want_separate_host_toolset==1', {
+          'toolsets': ['host', 'target'],
+        }, {
+          'toolsets': ['target'],
+        }]
+      ],
       'actions': [
         {
           'action_name': 'convert_js_to_cpp_char_array',
@@ -61,6 +75,13 @@
     },
     { 'target_name': 'protocol_compatibility',
       'type': 'none',
+      'conditions': [
+        ['want_separate_host_toolset==1', {
+          'toolsets': ['host', 'target'],
+        }, {
+          'toolsets': ['target'],
+        }]
+      ],
       'actions': [
         {
           'action_name': 'protocol_compatibility',
@@ -83,6 +104,13 @@
     { 'target_name': 'protocol_generated_sources',
       'type': 'none',
       'dependencies': [ 'protocol_compatibility' ],
+      'conditions': [
+        ['want_separate_host_toolset==1', {
+          'toolsets': ['host', 'target'],
+        }, {
+          'toolsets': ['target'],
+        }]
+      ],
       'actions': [
         {
           'action_name': 'protocol_generated_sources',