Improve system call support on NT

- Improve i/o perf on New Technology
- Code cleanup on read() for New Technology
- Fix bad bug with dup() of socket on New Technology
- Clean up some more strace errors on New Technology

libc/runtime/arch_prctl.c

@@ -161,6 +161,8 @@ static struct InterruptibleCall g_fsgs_icall;
  */
 int arch_prctl(int code, int64_t addr) {
   void *fn = arch_prctl_fsgsbase;
+
+#if 0
   if (!g_fsgs_once) {
     g_fsgs_once = true;
     if (X86_HAVE(FSGSBASE)) {
@@ -180,6 +182,8 @@ int arch_prctl(int code, int64_t addr) {
   if (g_fsgs_once == 2) {
     return arch_prctl_fsgsbase(code, addr);
   }
+#endif
+
   switch (__hostos) {
     case METAL:
       return arch_prctl_msr(code, addr);

libc/runtime/getsymboltable.c

@@ -114,10 +114,12 @@ noasan static struct SymbolTable *GetSymbolTableFromElf(void) {
  * @return symbol table, or NULL w/ errno on first call
  */
 noasan struct SymbolTable *GetSymbolTable(void) {
+  int ft, st;
   struct Zipos *z;
   static struct SymbolTable *t;
   if (!t) {
-    ++g_ftrace;
+    ft = g_ftrace, g_ftrace = 0;
+    st = __strace, __strace = 0;
     if (weaken(__zipos_get) && (z = weaken(__zipos_get)())) {
       if ((t = GetSymbolTableFromZip(z))) {
         t->names = (uint32_t *)((char *)t + t->names_offset);
@@ -127,7 +129,8 @@ noasan struct SymbolTable *GetSymbolTable(void) {
     if (!t) {
       t = GetSymbolTableFromElf();
     }
-    --g_ftrace;
+    g_ftrace = ft;
+    __strace = st;
   }
   return t;
 }

libc/runtime/msync-nt.c

@@ -22,7 +22,10 @@
 #include "libc/nt/files.h"
 #include "libc/nt/memory.h"
 #include "libc/runtime/memtrack.internal.h"
+#include "libc/sysv/consts/map.h"
 #include "libc/sysv/consts/msync.h"
+#include "libc/sysv/consts/o.h"
+#include "libc/sysv/consts/prot.h"
 
 #define ADDR(x) ((char *)((int64_t)((uint64_t)(x) << 32) >> 16))
 
@@ -41,13 +44,7 @@ noasan textwindows int sys_msync_nt(char *addr, size_t size, int flags) {
         rc = -1;
         break;
       }
-      if (flags & MS_SYNC) {
-        if (!FlushFileBuffers(_mmi.p[i].h)) {
-          // TODO(jart): what's up with this?
-          // rc = -1;
-          // break;
-        }
-      }
+      // TODO(jart): FlushFileBuffers too on g_fds handle if MS_SYNC?
     } else {
       break;
     }