Change order of headers in cpp_dummy_build.cpp

check_config.h needs to be included directly after the configuration file,
because some headers are naughty and adapt the defined configurations, which can
cause check_comfig.h to break. (Specically bignum.h sets the configured
platform to MBEDTLS_HAVE_INT32/64 if it hasn't been defined).

That arguably is a bug, although it's the existing behaviour of the library,
so we respect it and move check_config.h to where it wants to be.

Signed-off-by: Simon Butcher <simon.butcher@arm.com>

programs/test/cpp_dummy_build.cpp

@@ -25,6 +25,7 @@
 #else
 #include MBEDTLS_CONFIG_FILE
 #endif
+#include "mbedtls/check_config.h"
 
 #include "mbedtls/aes.h"
 #include "mbedtls/aesni.h"
@@ -41,7 +42,6 @@
 #include "mbedtls/certs.h"
 #include "mbedtls/chacha20.h"
 #include "mbedtls/chachapoly.h"
-#include "mbedtls/check_config.h"
 #include "mbedtls/cipher.h"
 #include "mbedtls/cipher_internal.h"
 #include "mbedtls/cmac.h"