enable more C++ tests

[Bruno Haible]

The gnulib-tool option --with-c++-tests as a filter. That is, it does
not add dependencies. Rather its absence filters out dependencies. So,
a 'foo-c++-tests' module is ineffective if there is no dependency to it.


2018-08-06  Bruno Haible  <address@hidden>

        Enable more C++ tests.
        * modules/inttypes-tests (Depends-on): Add inttypes-c++-tests.
        * modules/monetary-tests (Depends-on): Add monetary-c++-tests.
        * modules/strings-tests (Depends-on): Add strings-c++-tests.
        * modules/sys_resource-tests (Depends-on): Add sys_resource-c++-tests.
        * modules/utime-h-tests (Depends-on): Add utime-h-c++-tests.

diff --git a/modules/inttypes-tests b/modules/inttypes-tests
index 0f0727e..4510912 100644
--- a/modules/inttypes-tests
+++ b/modules/inttypes-tests
@@ -2,6 +2,7 @@ Files:
 tests/test-inttypes.c
 
 Depends-on:
+inttypes-c++-tests
 
 configure.ac:
 
diff --git a/modules/monetary-tests b/modules/monetary-tests
index eedd0a1..7b93396 100644
--- a/modules/monetary-tests
+++ b/modules/monetary-tests
@@ -2,6 +2,7 @@ Files:
 tests/test-monetary.c
 
 Depends-on:
+monetary-c++-tests
 
 configure.ac:
 
diff --git a/modules/strings-tests b/modules/strings-tests
index b414a12..ad66af4 100644
--- a/modules/strings-tests
+++ b/modules/strings-tests
@@ -2,6 +2,7 @@ Files:
 tests/test-strings.c
 
 Depends-on:
+strings-c++-tests
 
 configure.ac:
 
diff --git a/modules/sys_resource-tests b/modules/sys_resource-tests
index fbb13b9..9c40ba0 100644
--- a/modules/sys_resource-tests
+++ b/modules/sys_resource-tests
@@ -2,6 +2,7 @@ Files:
 tests/test-sys_resource.c
 
 Depends-on:
+sys_resource-c++-tests
 
 configure.ac:
 
diff --git a/modules/utime-h-tests b/modules/utime-h-tests
index 804fd60..63fb5e6 100644
--- a/modules/utime-h-tests
+++ b/modules/utime-h-tests
@@ -2,6 +2,7 @@ Files:
 tests/test-utime-h.c
 
 Depends-on:
+utime-h-c++-tests
 
 configure.ac: