v8: add missing ',' in OpenBSD's 'sources' section. Add

stack_trace_posix to 'sources' as well.

Fixes #15784
Fixes nodejs/help#992

add stack_trace_posix to OpenBSD's sources

Author: qbit

deps/v8/src/v8.gyp

@@ -2068,9 +2068,10 @@
                 '-L/usr/local/lib -lexecinfo',
             ]},
             'sources': [
+              'base/debug/stack_trace_posix.cc',
               'base/platform/platform-openbsd.cc',
               'base/platform/platform-posix.h',
-              'base/platform/platform-posix.cc'
+              'base/platform/platform-posix.cc',
               'base/platform/platform-posix-time.h',
               'base/platform/platform-posix-time.cc',
             ],