remove signal functionalities

Author: leongross

GNUmakefile

@@ -338,7 +338,6 @@ TEST_PACKAGES_FAST = \
 	net/http/internal/ascii \
 	net/mail \
 	os \
-	os/signal \
 	path \
 	reflect \
 	sync \

src/os/exec.go

@@ -47,10 +47,6 @@ func (p *ProcessState) Sys() interface{} {
 	return nil // TODO
 }
 
-func (p *ProcessState) Exited() bool {
-	return false // TODO
-}
-
 // ExitCode returns the exit code of the exited process, or -1
 // if the process hasn't exited or was terminated by a signal.
 func (p *ProcessState) ExitCode() int {