liboping: no need to check for clock_gettime

Buildroot no longer supports toolchains with glibc older than 2.17, so there
is no need to check whether librt is required for clock_* system calls.

Cc: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/liboping/0001-configure-also-check-for-clockgettime.patch

@@ -1,39 +0,0 @@
-From a45f3610beba1f7e6e1a038e3a1fe4150057c262 Mon Sep 17 00:00:00 2001
-From: "Yann E. MORIN" <yann.morin.1998@free.fr>
-Date: Tue, 5 Jul 2016 15:31:28 +0200
-Subject: [PATCH] configure: also check for clockgettime()
-
-clock_gettime() is also in -lrt so we also need to check for it.
-
-Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
----
- configure.ac | 10 +++++++---
- 1 file changed, 7 insertions(+), 3 deletions(-)
-
-diff --git a/configure.ac b/configure.ac
-index f83f5ab..3b6ae09 100644
---- a/configure.ac
-+++ b/configure.ac
-@@ -199,12 +199,16 @@ fi
- 
- AC_SUBST(LIBOPING_PC_LIBS_PRIVATE)
- 
--nanosleep_needs_rt="no"
-+needs_rt="no"
- AC_CHECK_FUNCS(nanosleep, [],
- 	AC_CHECK_LIB(rt, nanosleep,
--		[nanosleep_needs_rt="yes"],
-+		[needs_rt="yes"],
- 		AC_MSG_ERROR(cannot find nanosleep)))
--AM_CONDITIONAL(BUILD_WITH_LIBRT, test "x$nanosleep_needs_rt" = "xyes")
-+AC_CHECK_FUNCS(clock_gettime, [],
-+	AC_CHECK_LIB(rt, clock_gettime,
-+		[needs_rt="yes"],
-+		AC_MSG_ERROR(cannot find clock_gettime)))
-+AM_CONDITIONAL(BUILD_WITH_LIBRT, test "x$needs_rt" = "xyes")
- 
- with_ncurses="no"
- AC_CHECK_HEADERS(ncursesw/ncurses.h ncurses.h, [with_ncurses="yes"], [])
--- 
-2.7.4
-

package/liboping/liboping.mk

@@ -13,6 +13,4 @@ LIBOPING_CONF_OPTS = --without-perl-bindings
 LIBOPING_LICENSE = LGPL-2.1+, GPL-2.0
 LIBOPING_LICENSE_FILES = COPYING
 
-LIBOPING_AUTORECONF = YES
-
 $(eval $(autotools-package))