ltp-testsuite: disable Open POSIX testsuite

The Open POSIX testsuite builds and installs to the target directory a
program called 't0' that isn't cross-compiled, which is bad.

Since the LTP build system is autoconf but not automake based, and the
Open POSIX testsuite is a sort of sub-project inside it, fixing the
issue is not trivial.

Therefore, we simply disable the Open POSIX testsuite entirely. Oddly
enough, --without-open-posix-testsuite doesn't work due to another bug,
so we simply have to remove --with-open-posix-testsuite.

Open POSIX testsuite cross-compilation issue reported at
https://github.com/linux-test-project/ltp/issues/144.

Configure script bug reported at
https://github.com/linux-test-project/ltp/issues/143.

Fixes:

  http://autobuild.buildroot.net/results/8326ba9eb257dfc92c1ad282ba6d3565e8250def/

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Tested-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
(cherry picked from commit b57e1355a72da407c19315cb4187767d28e4d064)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/ltp-testsuite/ltp-testsuite.mk

@@ -9,8 +9,16 @@ LTP_TESTSUITE_SOURCE = ltp-full-$(LTP_TESTSUITE_VERSION).tar.xz
 LTP_TESTSUITE_SITE = https://github.com/linux-test-project/ltp/releases/download/$(LTP_TESTSUITE_VERSION)
 LTP_TESTSUITE_LICENSE = GPLv2, GPLv2+
 LTP_TESTSUITE_LICENSE_FILES = COPYING
+
+# Do not enable Open POSIX testsuite as it doesn't cross-compile
+# properly: t0 program is built for the host machine. Notice that due
+# to a bug, --without-open-posix-testsuite actually enables the test
+# suite.
+# See https://github.com/linux-test-project/ltp/issues/143 (invalid
+# autoconf test) and
+# https://github.com/linux-test-project/ltp/issues/144 (Open POSIX
+# testsuite not cross-compiling).
 LTP_TESTSUITE_CONF_OPTS += \
-	--with-open-posix-testsuite \
 	--with-realtime-testsuite
 
 ifeq ($(BR2_LINUX_KERNEL),y)