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/mapviewoffileexnuma.greg.c

@@ -24,7 +24,7 @@
 #include "libc/nt/enum/filemapflags.h"
 #include "libc/nt/memory.h"
 
-extern typeof(MapViewOfFileExNuma) *const __imp_MapViewOfFileExNuma __msabi;
+__msabi extern typeof(MapViewOfFileExNuma) *const __imp_MapViewOfFileExNuma;
 
 /**
  * Maps view of file mapping into memory on the New Technology.
@@ -47,7 +47,7 @@ textwindows void *MapViewOfFileExNuma(int64_t hFileMappingObject,
       hFileMappingObject, dwDesiredAccess, dwFileOffsetHigh, dwFileOffsetLow,
       dwNumberOfBytesToMap, opt_lpDesiredBaseAddress, nndDesiredNumaNode);
   if (!pStartingAddress) __winerr();
-  STRACE("MapViewOfFileExNuma(%ld, %s, off:%'ld, size:%'zu, %p) → %p% m",
+  STRACE("MapViewOfFileExNuma(%ld, %s, %'ld, %'zu, %p) → %p% m",
          hFileMappingObject, DescribeNtFileMapFlags(dwDesiredAccess),
          (uint64_t)dwFileOffsetHigh << 32 | dwFileOffsetLow,
          dwNumberOfBytesToMap, opt_lpDesiredBaseAddress, pStartingAddress);