Select rand_rangeXX() variant only based on the requested range (#9418)

This fixes an incompatibility when wrapping native 32-bit engines with a userland
engine. The latter always used the 64-bit range function which then used two
32-bit numbers from the underlying engine to fill the 64-bit range, whereas the
native implementation used only one.

Now the selection of the range variant only depends on the requested range. A
32-bit range uses the 32-bit variant (even for 64-bit engines), whereas a
larger range uses the 64-bit variant.

This was found in https://github.com/php/php-src/pull/9410#discussion_r953213000

NEWS

@@ -17,6 +17,7 @@ PHP                                                                        NEWS
 - Random:
   . Fixed bug GH-9415 (Randomizer::getInt(0, 2**32 - 1) with Mt19937
     always returns 1). (timwolla)
+  . Fixed Randomizer::getInt() consistency for 32-bit engines. (timwolla)
 
 - Streams:
   . Fixed bug GH-9316 ($http_response_header is wrong for long status line).