[random] remove unnecessary old header files

[zeriyoshi]

#8094

The Random Extension 5.x implementation kept the old header files to maintain extension compatibility.

• ext/standard/php_lcg.h
• ext/standard/php_rand.h
• ext/standard/php_mt_rand.h
• ext/standard/php_random.h

However, these files actually exist only to include php_random.h in the new ext/random and are no longer needed.

Deleting these files may affect some extensions, but this should not be a problem since it can be easily handled by branching with preprocessor macros.

#if PHP_VERSION_ID < 80200
# include "ext/standard/php_ABC.h"
# include "ext/standard/php_XYZ.h"
#else
# include "ext/random/php_random.h"
#endif

cc / @TimWolla @kocsismate

[guilliamxavier]

I'm a bit confused here, as @bukka (who asked the question) eventually "agreed" to the rationale to not remove them (https://github.com/php/php-src/pull/8094/files#r920702114) 😕 Wouldn't it be "better" to delay the removal to PHP 9.0? /cc @Danack (who requested to keep them)

[zeriyoshi]

@guilliamxavier
Sorry, I was confused too. I suggest taking down this PR and removing it at 9.0.

[Danack]

Thanks. And yeah, batching up BC breaks until major versions, even if that means having a few 'dead' files around means less work overall for extension maintainers, probably.