remove leftover debug output in configure

Change-Id: If2b1d7ca89f30544c4e8750119927701f9df5264
diff --git a/configure.ac b/configure.ac
index 7ba93a3..8a8b4ba 100644
--- a/configure.ac
+++ b/configure.ac
@@ -7067,7 +7067,6 @@ if test "$COM_IS_CLANG" = "TRUE"; then
            AC_MSG_RESULT([$CLANGTOOLLIBS])
            if test -z "$CLANGTOOLLIBS"; then
                if test "$compiler_plugins" = "yes"; then
                    cat config.log
                    AC_MSG_ERROR([Cannot find Clang libraries to build compiler plugins.])
                else
                    AC_MSG_WARN([Cannot find Clang libraries to build compiler plugins, plugins disabled])