Check of supported peripheral/function in main.cpp test files are misplaced

[bcostm]

In all the test files (for example in mbed/libraries/tests/mbed/rtc/main.cpp),
where the peripheral/function is checked, the check of the peripheral/function must be placed after the includes:

Today it is:

#if !DEVICE_RTC
  #error [NOT_SUPPORTED] RTC is not supported
#endif
#include "mbed.h"
#include "test_env.h"

While it must be:

#include "mbed.h"
#include "test_env.h"
#if !DEVICE_RTC
  #error [NOT_SUPPORTED] RTC is not supported
#endif

[0xc0170]

cc @bridadan

[bridadan]

Oops, dumb mistake. Sorry everyone! PR submitted: #1613