build: fix ninja build failure

When working on commit 6a09a69ec9d36b705e9bde2ac1a193566a702d96
("build: enable cctest to use generated objects") I did not take into
account building with ninja:

$ ./configure
$ tools/gyp_node.py -f ninja
$ ninja -C out/Release
$ ln -fs out/Release/node node

When ninja generated the ninja build files, src files that are
relative to the src directory will be named with a dot instead of a
path separator, for example:

out/Release/obj/src/node/node.o
would instead become:
out/Release/obj/src/node.node.o

This commit adds an additional variable for the type of object separator
used for this case.

Currently the check for if ninja is being used is a normal if statement
as are the following os checks (win and aix). But the win and aix ones
should only be evaluated if the build is not generated by ninja.
This commit turns this logic into an if ninja else statement.

PR-URL: https://github.com/nodejs/node/pull/12484
Fixes: https://github.com/nodejs/node/issues/12448
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>

0 files changed, 0 insertions, 0 deletions