getrlimit.2, getrusage.2: Remove unused include

<sys/time.h> is not required by any of the function declarations
or macro definitions used by these functions.  It may be (or maybe
not) needed by some type inside the rlimit structure, but that
info belongs in system_data_types(7), not here.

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

man2/getrlimit.2

@@ -66,7 +66,6 @@
 getrlimit, setrlimit, prlimit \- get/set resource limits
 .SH SYNOPSIS
 .nf
-.B #include <sys/time.h>
 .B #include <sys/resource.h>
 .PP
 .BI "int getrlimit(int " resource ", struct rlimit *" rlim );

man2/getrusage.2

@@ -41,7 +41,6 @@
 getrusage \- get resource usage
 .SH SYNOPSIS
 .nf
-.B #include <sys/time.h>
 .B #include <sys/resource.h>
 .PP
 .BI "int getrusage(int " who ", struct rusage *" usage );
@@ -230,14 +229,6 @@ is Linux-specific.
 Resource usage metrics are preserved across an
 .BR execve (2).
 .PP
-Including
-.I <sys/time.h>
-is not required these days, but increases portability.
-(Indeed,
-.I struct timeval
-is defined in
-.IR <sys/time.h> .)
-.PP
 In Linux kernel versions before 2.6.9, if the disposition of
 .B SIGCHLD
 is set to