For some reason, aa5961a445 caused
'make test' to rebuild the entire project every time. Applying
the fix to the other place where gyp chops up the argument list
makes it behave properly.
Older bash versions in `sh -c` mode don't parse `export FOO=42` constructs,
they bail out with a "FOO is not an identifier" error message.
This was fixed somewhere between bash 4.1.0 and 4.1.5 but let's support the
older versions anyway.
Hoist common settings into common.gypi.
Restrict v8's common.gypi to v8 projects.
Ensure v8 doesn't use /MP in debug builds.
Add basic settings for other platforms.
Make uv import common.gypi properly.
Remove LTCG warning.