Fix build for windows (#12115)

Author: abyss7

ydb/core/mon_alloc/tcmalloc.cpp

@@ -533,6 +533,7 @@ class TTcMallocLimitHandler : public TSingletonTraits<TTcMallocLimitHandler> {
 
         *Out_ << tcmalloc::MallocExtension::GetStats() << Endl;
 
+#ifndef _win_
         if (auto childPid = fork(); childPid == 0) {
             kill(getppid(), SIGSTOP);
 
@@ -555,6 +556,7 @@ class TTcMallocLimitHandler : public TSingletonTraits<TTcMallocLimitHandler> {
         }
 
         // TODO: probably should wait for child, but we're going to OOM anyway.
+#endif
     }
 };