Merge #21115: test: Fix Windows cross build

723eb43 test: Fix Windows cross build (Hennadii Stepanov)

Pull request description:

  On master (e51f6c4, after #20936 merge), Windows cross compiling fails:
  ```
  $ make > /dev/null
  In file included from ./policy/fees.h:12,
                   from policy/fees.cpp:6:
  policy/fees.cpp: In member function ‘unsigned int CBlockPolicyEstimator::HighestTargetTracked(FeeEstimateHorizon) const’:
  ./sync.h:232:104: warning: control reaches end of non-void function [-Wreturn-type]
    232 | #define LOCK(cs) DebugLock<decltype(cs)> PASTE2(criticalblock, __COUNTER__)(cs, #cs, __FILE__, __LINE__)
        |                                                                                                        ^
  policy/fees.cpp:680:5: note: in expansion of macro ‘LOCK’
    680 |     LOCK(m_cs_fee_estimator);
        |     ^~~~
  test/fuzz/netaddress.cpp:12:10: fatal error: netinet/in.h: No such file or directory
     12 | #include <netinet/in.h>
        |          ^~~~~~~~~~~~~~
  compilation terminated.
  make[2]: *** [Makefile:13039: test/fuzz/fuzz-netaddress.o] Error 1
  make[2]: *** Waiting for unfinished jobs....
  libtool: warning: undefined symbols not allowed in x86_64-w64-mingw32 shared libraries; building static only
  test/fuzz/string.cpp: In function ‘void string_fuzz_target(FuzzBufferType)’:
  test/fuzz/string.cpp:81:11: error: ‘ShellEscape’ was not declared in this scope
     81 |     (void)ShellEscape(random_string_1);
        |           ^~~~~~~~~~~
  make[2]: *** [Makefile:13543: test/fuzz/fuzz-string.o] Error 1
  make[1]: *** [Makefile:15078: all-recursive] Error 1
  make: *** [Makefile:812: all-recursive] Error 1
  ```

  This PR fixes both of errors.

ACKs for top commit:
  MarcoFalke:
    cr ACK 723eb43

Tree-SHA512: 5d2fba5ca806e64bf92011786d1f868c6624f786bfa753a10316feab7a802a28ec27a4bd25fc26dc289a399895a521c3878ffa1efeff0e540c7245cdb8e4942c

Author: fanquake

src/test/fuzz/netaddress.cpp

@@ -9,7 +9,6 @@
 
 #include <cassert>
 #include <cstdint>
-#include <netinet/in.h>
 #include <vector>
 
 FUZZ_TARGET(netaddress)

src/test/fuzz/string.cpp

@@ -78,7 +78,9 @@ FUZZ_TARGET(string)
     }
     (void)SanitizeString(random_string_1);
     (void)SanitizeString(random_string_1, fuzzed_data_provider.ConsumeIntegralInRange<int>(0, 3));
+#ifndef WIN32
     (void)ShellEscape(random_string_1);
+#endif // WIN32
     int port_out;
     std::string host_out;
     SplitHostPort(random_string_1, port_out, host_out);