configure: Drop unused AC_C_CHAR_UNSIGNED test

Unused since commit 0c8c169. v4.3.3.

Signed-off-by: Markus Armbruster <armbru@pond.sub.org>

diff --git a/configure.ac b/configure.ac
index 549ffad4f1d8d83955a48916787d4d163808dc9a..e49eb3b3080997d7783a06ddf756d001d00b03f8 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -81,8 +81,6 @@ LIBS_server="$LIBS"
 
 ### Checks for typedefs, structures, and compiler characteristics
 
-AC_C_CHAR_UNSIGNED
-
 
 ### Checks for library functions