execute tests: Fix test failure when libtool is in use

[Bruno Haible]

When building GNU gettext on Cygwin, I see this test failure in the
gnulib tests:

FAIL: test-execute.sh
=====================

test-execute-main: test-execute-child.exe subprocess failed
test-execute-child:./.libs/lt-test-execute-child.c:236: FATAL: couldn't find 
./test-execute-child.
../../../gettext-tools/gnulib-tests/test-execute-main.c:476: assertion 'ret == 
0' failed
../../../gettext-tools/gnulib-tests/test-execute.sh: line 4:  7692 Aborted      
           (core dumped) ${CHECKER} ./test-execute-main${EXEEXT} 
./test-execute-child${EXEEXT} $i
test-execute.sh: test case 21 failed
FAIL test-execute.sh (exit status: 1)

It seems to be an problem in the libtool wrapper for the test-execute-child
program. The test case 21, that fails, is the one where the current directory
is changed.

This patch fixes it.


2021-08-25  Bruno Haible  <bruno@clisp.org>

        execute tests: Fix test failure when libtool is in use.
        * modules/execute-tests (Makefile.am): Link test-execute-child without
        using libtool.
        * modules/spawn-pipe-tests (Makefile.am): Link test-spawn-pipe-child
        without using libtool.
        * modules/system-quote-tests (Makefile.am): Link test-system-quote-child
        without using libtool.

diff --git a/modules/execute-tests b/modules/execute-tests
index c9421302b..735f55c94 100644
--- a/modules/execute-tests
+++ b/modules/execute-tests
@@ -28,6 +28,7 @@ test_execute_main_LDADD = $(LDADD) @LIBINTL@ $(LIBTHREAD)
 # The test-execute-child program must be a real executable, not a libtool
 # wrapper script, and should link against as few libraries as possible.
 # Therefore don't link it against any libraries other than -lc.
+test_execute_child_LINK = $(CCLD) $(AM_CFLAGS) $(CFLAGS) $(AM_LDFLAGS) 
$(LDFLAGS) -o $@
 test_execute_child_LDADD =
 
 TESTS += test-execute-script
diff --git a/modules/spawn-pipe-tests b/modules/spawn-pipe-tests
index 5dbd28d74..a204031a6 100644
--- a/modules/spawn-pipe-tests
+++ b/modules/spawn-pipe-tests
@@ -22,6 +22,7 @@ test_spawn_pipe_main_LDADD = $(LDADD) @LIBINTL@ $(LIBTHREAD)
 # The test-spawn-pipe-child program must be a real executable, not a libtool
 # wrapper script, and should link against as few libraries as possible.
 # Therefore don't link it against any libraries other than -lc.
+test_spawn_pipe_child_LINK = $(CCLD) $(AM_CFLAGS) $(CFLAGS) $(AM_LDFLAGS) 
$(LDFLAGS) -o $@
 test_spawn_pipe_child_LDADD =
 
 TESTS += test-spawn-pipe-script
diff --git a/modules/system-quote-tests b/modules/system-quote-tests
index 4e2782a9a..22f08389f 100644
--- a/modules/system-quote-tests
+++ b/modules/system-quote-tests
@@ -22,4 +22,5 @@ test_system_quote_main_LDADD = $(LDADD) @LIBINTL@ 
$(LIB_MBRTOWC)
 # The test-system-quote-child program must be a real executable, not a libtool
 # wrapper script, and should link against as few libraries as possible.
 # Therefore don't link it against any libraries other than -lc.
+test_system_quote_child_LINK = $(CCLD) $(AM_CFLAGS) $(CFLAGS) $(AM_LDFLAGS) 
$(LDFLAGS) -o $@
 test_system_quote_child_LDADD =