Merge bitcoin/bitcoin#26826: refactor: remove windows-only compat.h usage in randomenv

b358bde020 randomenv: consolidate WIN32 #ifdefs (fanquake)
fff80cd248 random: remove windows-only compat.h include in randomenv (fanquake)

Pull request description:

  Similar to #26814.

  Having a windows-only include of compat.h is confusing, not-only because it's already included globally via util/time.h, but also because it's unclear why compat.h is included (neither of the required headers are included there).

  This change is related to removing the use of compat.h as a miscellaneous catch-all for unclear/platform specific includes. Somewhat prompted by IWYU-related discussion here: https://github.com/bitcoin/bitcoin/pull/26763/files#r1058861693.

ACKs for top commit:
  hebasto:
    ACK b358bde020.
  TheCharlatan:
    ACK b358bde020

Tree-SHA512: d46dffe36a17ad0f9374a55e0ecaf2d60d0b473c8fc9ad6f3005142014c08a7c10bae4948856531abb443f5e0bd6062958fe574197e282dad22ae50134d71e5f

src/randomenv.cpp

@@ -13,21 +13,21 @@
 #include <compat/cpuid.h>
 #include <crypto/sha512.h>
 #include <support/cleanse.h>
-#include <util/time.h> // for GetTime()
-#ifdef WIN32
-#include <compat/compat.h>
-#endif
+#include <util/time.h>
 
 #include <algorithm>
 #include <atomic>
+#include <cstdint>
+#include <cstring>
 #include <chrono>
 #include <climits>
 #include <thread>
 #include <vector>
 
-#include <stdint.h>
-#include <string.h>
-#ifndef WIN32
+#ifdef WIN32
+#include <windows.h>
+#include <winreg.h>
+#else
 #include <sys/types.h> // must go before a number of other headers
 #include <fcntl.h>
 #include <netinet/in.h>