Generic variable names cause collisions

[rin67630]

The ArduinoBearSSL library seem to create a problem:

Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.2/tools/sdk/include/bearssl/bearssl_rand.h:205:16: note: in expansion of macro 'V'
  205 |  unsigned char V[64];

ArduinoBearSSL/src/bearssl/bearssl_rand.h

Lines 196 to 208 in d7a68ae

	typedef struct {
	/**
	* \brief Pointer to the vtable.
	*
	* This field is set with the initialisation method/function.
	*/
	const br_prng_class *vtable;
	#ifndef BR_DOXYGEN_IGNORE
	unsigned char K[64];
	unsigned char V[64];
	const br_hash_class *digest_class;
	#endif
	} br_hmac_drbg_context;

Variables should not be named with capital letters, which conflicts with macros and constants.
Moreover it is recommended to take less generic names in libraries.