Improve synchronization

- Fix bugs in kDos2Errno definition
- malloc() should now be thread safe
- Fix bug in rollup.com header generator
- Fix open(O_APPEND) on the New Technology
- Fix select() on the New Technology and test it
- Work towards refactoring i/o for thread safety
- Socket reads and writes on NT now poll for signals
- Work towards i/o completion ports on the New Technology
- Make read() and write() intermittently check for signals
- Blinkenlights keyboard i/o so much better on NT w/ poll()
- You can now poll() files and sockets at the same time on NT
- Fix bug in appendr() that manifests with dlmalloc footers off

libc/intrin/mapviewoffileex.greg.c

@@ -23,7 +23,7 @@
 #include "libc/nt/enum/filemapflags.h"
 #include "libc/nt/memory.h"
 
-extern typeof(MapViewOfFileEx) *const __imp_MapViewOfFileEx __msabi;
+__msabi extern typeof(MapViewOfFileEx) *const __imp_MapViewOfFileEx;
 
 /**
  * Maps view of file mapping into memory on the New Technology.
@@ -45,8 +45,8 @@ textwindows void *MapViewOfFileEx(int64_t hFileMappingObject,
       hFileMappingObject, dwDesiredAccess, dwFileOffsetHigh, dwFileOffsetLow,
       dwNumberOfBytesToMap, opt_lpDesiredBaseAddress);
   if (!pStartingAddress) __winerr();
-  STRACE("MapViewOfFileEx(%ld, %s, off:%'ld, size:%'zu, addr:%p) → %p% m",
-         hFileMappingObject, DescribeNtFileMapFlags(dwDesiredAccess),
+  STRACE("MapViewOfFileEx(%ld, %s, %'ld, %'zu, %p) → %p% m", hFileMappingObject,
+         DescribeNtFileMapFlags(dwDesiredAccess),
          (uint64_t)dwFileOffsetHigh << 32 | dwFileOffsetLow,
          dwNumberOfBytesToMap, opt_lpDesiredBaseAddress, pStartingAddress);
   return pStartingAddress;