c-ctype tests: link error on Solaris 9

[Bruno Haible]

The function isblank() does not exist on Solaris 9.
We started to make use of isblank() in tests/test-c-ctype.c on 2015-09-23,
leading to a link error on Solaris, as reported in
<https://savannah.gnu.org/bugs/?46827>. This should fix it.


2016-12-09  Bruno Haible  <address@hidden>

        c-ctype tests: Fix link error on Solaris 9.
        * modules/c-ctype-tests (Depends-on): Add 'isblank'.
        Reported at <https://savannah.gnu.org/bugs/?46827>.

diff --git a/modules/c-ctype-tests b/modules/c-ctype-tests
index cb65ee3..e66a4cc 100644
--- a/modules/c-ctype-tests
+++ b/modules/c-ctype-tests
@@ -4,6 +4,7 @@ tests/macros.h
 
 Depends-on:
 ctype
+isblank
 
 configure.ac: