configure: allow V8 snapshot for cross-compilation

Signed-off-by: Fedor Indutny <fedor@indutny.com>

common.gypi

@@ -1,13 +1,13 @@
 {
   'variables': {
-    'werror': '',                    # Turn off -Werror in V8 build.
-    'visibility%': 'hidden',         # V8's visibility setting
-    'target_arch%': 'ia32',          # set v8's target architecture
-    'host_arch%': 'ia32',            # set v8's host architecture
-    'want_separate_host_toolset': 0, # V8 should not build target and host
-    'library%': 'static_library',    # allow override to 'shared_library' for DLL/.so builds
-    'component%': 'static_library',  # NB. these names match with what V8 expects
-    'msvs_multi_core_compile': '0',  # we do enable multicore compiles, but not using the V8 way
+    'werror': '',                     # Turn off -Werror in V8 build.
+    'visibility%': 'hidden',          # V8's visibility setting
+    'target_arch%': 'ia32',           # set v8's target architecture
+    'host_arch%': 'ia32',             # set v8's host architecture
+    'want_separate_host_toolset%': 0, # V8 should not build target and host
+    'library%': 'static_library',     # allow override to 'shared_library' for DLL/.so builds
+    'component%': 'static_library',   # NB. these names match with what V8 expects
+    'msvs_multi_core_compile': '0',   # we do enable multicore compiles, but not using the V8 way
     'gcc_version%': 'unknown',
     'clang%': 0,
     'python%': 'python',

configure

@@ -471,6 +471,9 @@ def configure_node(o):
   o['variables']['host_arch'] = host_arch
   o['variables']['target_arch'] = target_arch
 
+  if target_arch != host_arch and not options.without_snapshot:
+    o['variables']['want_separate_host_toolset'] = 1
+
   if target_arch == 'arm':
     configure_arm(o)
   elif target_arch in ('mips', 'mipsel'):