[COMMITTED] string: Move tst-strsignal tst-strerror to tests-container

[Adhemerval Zanella]

Both tests require libc.mo translation files which might not be
installed on the system.

Checked on x86_64-linux-gnu.
---
 string/Makefile | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/string/Makefile b/string/Makefile
index f8d3104e16..206c9b103c 100644
--- a/string/Makefile
+++ b/string/Makefile
@@ -63,7 +63,9 @@ tests		:= tester inl-tester noinl-tester testcopy test-ffs	\
 		   tst-strtok_r bug-strcoll2 tst-cmp tst-xbzero-opt	\
 		   test-endian-types test-endian-file-scope		\
 		   test-endian-sign-conversion tst-memmove-overflow	\
-		   tst-strsignal tst-strerror test-sig_np
+		   test-sig_np
+
+tests-container += tst-strsignal tst-strerror
 
 # This test allocates a lot of memory and can run for a long time.
 xtests = tst-strcoll-overflow
-- 
2.25.1