deps: cherry-pick 6f68f30 from v8 upstream

Original commit message:

[build] Add force_dynamic_crt option to build a static library with /…
…MD on windows

Adds option to build a V8 library statically, but with the options on
windows that allows it to be subsequently included in another DLL. On
Windows this is required for it to correclty link against the correct
C++ runtime. Require for our Node.js shared library build.

Reference:  nodejs/node#7487

BUG=
R=machenbach@chromium.org, michael_dawson@ca.ibm.com

Committed: https://crrev.com/9cf88c1c364cf76c1e745aa63196768435e8ef5d
Review-Url: https://codereview.chromium.org/2149963002
Cr-Original-Commit-Position: refs/heads/master@{#37814}
Cr-Commit-Position: refs/heads/master@{#37856}

PR-URL: https://github.com/nodejs/node/pull/7802
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>

deps/v8/build/toolchain.gypi

@@ -39,6 +39,7 @@
     'ubsan_vptr%': 0,
     'v8_target_arch%': '<(target_arch)',
     'v8_host_byteorder%': '<!(python -c "import sys; print sys.byteorder")',
+    'force_dynamic_crt%': 0,
     # Native Client builds currently use the V8 ARM JIT and
     # arm/simulator-arm.cc to defer the significant effort required
     # for NaCl JIT support. The nacl_target_arch variable provides
@@ -1104,7 +1105,7 @@
           'VCCLCompilerTool': {
             'Optimization': '0',
             'conditions': [
-              ['component=="shared_library"', {
+              ['component=="shared_library" or force_dynamic_crt==1', {
                 'RuntimeLibrary': '3',  # /MDd
               }, {
                 'RuntimeLibrary': '1',  # /MTd
@@ -1156,7 +1157,7 @@
             'StringPooling': 'true',
             'BasicRuntimeChecks': '0',
             'conditions': [
-              ['component=="shared_library"', {
+              ['component=="shared_library" or force_dynamic_crt==1', {
                 'RuntimeLibrary': '3',  #/MDd
               }, {
                 'RuntimeLibrary': '1',  #/MTd
@@ -1347,7 +1348,7 @@
                 'FavorSizeOrSpeed': '0',
                 'StringPooling': 'true',
                 'conditions': [
-                  ['component=="shared_library"', {
+                  ['component=="shared_library" or force_dynamic_crt==1', {
                     'RuntimeLibrary': '2',  #/MD
                   }, {
                     'RuntimeLibrary': '0',  #/MT

deps/v8/include/v8-version.h

@@ -11,7 +11,7 @@
 #define V8_MAJOR_VERSION 5
 #define V8_MINOR_VERSION 1
 #define V8_BUILD_NUMBER 281
-#define V8_PATCH_LEVEL 78
+#define V8_PATCH_LEVEL 79
 
 // Use 1 for candidates and 0 otherwise.
 // (Boolean macro values are not supported by all preprocessors.)