Importing the patch of Roberto Vargas to inherit signal handlers.
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			@ -774,6 +774,13 @@ execsh(void) {
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	unsetenv("LINES");
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	unsetenv("TERMCAP");
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	signal(SIGCHLD, SIG_DFL);
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	signal(SIGHUP, SIG_DFL);
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	signal(SIGINT, SIG_DFL);
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	signal(SIGQUIT, SIG_DFL);
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	signal(SIGTERM, SIG_DFL);
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	signal(SIGALRM, SIG_DFL);
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	DEFAULT(envshell, SHELL);
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	putenv("TERM="TNAME);
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	args = opt_cmd ? opt_cmd : (char*[]){envshell, "-i", NULL};
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