Revert "ltp-testsuite: don't select libtirpc"

This reverts commit fc366046429471228c74be7f09d0645256649fd3 in favor of an
alternative solution in a subsequent patch.

Cc: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/ltp-testsuite/Config.in

@@ -7,6 +7,7 @@ config BR2_PACKAGE_LTP_TESTSUITE
 	depends on BR2_USE_MMU # fork()
 	depends on BR2_TOOLCHAIN_HAS_THREADS
 	depends on !BR2_TOOLCHAIN_USES_MUSL
+	select BR2_PACKAGE_LIBTIRPC if !BR2_TOOLCHAIN_HAS_NATIVE_RPC
 	# does not build, cachectl.h issue
 	depends on !BR2_nios2
 	help