Don't try to include mbedtls/config_*.h

They're included by build_info.h and must not be included directly.

Currently, this only concerns one file: config_psa.h. It's technically a bug
to include it, but a harmless one because that header has already been
included by build_info.h except in configurations where it
effectively had no effect (enabling PSA options with PSA turned off).

We plan to split config_psa.h into multiple headers that are less
independent, which could make the inclusion more problematic.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>

programs/test/generate_cpp_dummy_build.sh

@@ -63,6 +63,7 @@ EOF
     for header in include/mbedtls/*.h include/psa/*.h; do
         case ${header#include/} in
             mbedtls/mbedtls_config.h) :;; # not meant for direct inclusion
+            mbedtls/config_*.h) :;; # not meant for direct inclusion
             psa/crypto_config.h) :;; # not meant for direct inclusion
             # Some of the psa/crypto_*.h headers are not meant to be included
             # directly. They do have include guards that make them no-ops if