build,tools: fix cmd_regen_makefile

Currently, after having configured and built node and then updating a
dependent target the following error is produced when trying to rebuild
the project:

$ ./configure && make -j8
$ touch node.gypi
$ make -j8
configure: error: no such option: -f
make[1]: *** [Makefile:685: Makefile] Error 2

The reason for this is that the target 'cmd_regen_makefile' is using the
command 'configure' instead of 'gyp_node.py' in out/Makefile:
cmd_regen_makefile = cd $(srcdir); /work/nodejs/node/configure -fmake

As far as I can tell gyp is using sys.argv[0] as the 'gyp_binary' in
__init__.py:
params = {'options': options,
              ...
              'gyp_binary': sys.argv[0],

But when called via 'configure' sys.argv[0] is 'configure' instead of
gyp_node.py leading to the above error.

This commit suggests setting the program name explicitly in
gyp_node.py. Alternatively perhaps this could be done in configure.py
instead but I was not sure what would be best.

PR-URL: #34255
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>

tools/gyp_node.py

@@ -51,6 +51,12 @@ def run_gyp(args):
   args.append('-Dlinux_use_bundled_gold=0')
   args.append('-Dlinux_use_gold_flags=0')
 
+  # Set the current program to this module. This is done because gyp
+  # will use the program path in targets it generates. If this script was called
+  # by another script the program name will not be gyp_node.py but whatever
+  # the name of the script that called it is, leading to incorrect commands
+  # in generated targets (for example cmd_regen_makefile).
+  sys.argv[0] = os.path.abspath(__file__)
   rc = gyp.main(args)
   if rc != 0:
     print('Error running GYP')