Unify node.gyp code styling

[asamuzaK]

Version

16.13.1, maybe also 17.2.0 (not tested myself)

Platform

Microsoft Windows NT 10.0.19043.0 x64

Subsystem

node.gyp

What steps will reproduce the bug?

In #40481, it combines multiple lines of strings with \ before a line break.
See node/node.gyp at master · nodejs/node

This \ causes an error in gyp-parser addaleax/gyp-parser: GYP file format parser in JS.

I looked at the .gyp docs GYP - Input Format Reference, I wasn't sure if it allowed to combine multiple lines of strings with \.

But any way, it doesn't match code styling in the same file.
In other places, multiple lines are combined like

['"foo" and '
 '"bar"', {
}]

#L79
#L849

I think #L1479 should follow the same code styling.

How often does it reproduce? Is there a required condition?

Always since 16.13.1

What is the expected behavior?

Do not cause errors in other modules.

What do you see instead?

Parse error in gyp-parser.

Additional information

No response

[RaisinTen]

\ is used in a couple of other places too. You can run git grep --line-number '\\$' "*.gyp*" to get a full list if you would like to fix them all.