Make major improvements to redbean and libraries

The most exciting improvement is dynamic pages will soon be able to use
the executable itself as an object store. it required a heroic technique
for overcoming ETXTBSY restrictions which lets us open the executable in
read/write mode, which means (1) wa can restore the APE header, and (2)
we can potentially containerize redbean extension code so that modules
you download for your redbean online will only impact your redbean.

Here's a list of breaking changes to redbean:

- Remove /tool/net/ prefix from magic ZIP paths
- GetHeader() now returns NIL if header is absent

Here's a list of fixes and enhancements to redbean:

- Support 64-bit ZIP archives
- Record User-Agent header in logs
- Add twelve error handlers to accept()
- Display octal st_mode on listing page
- Show ZIP file comments on listing page
- Restore APE MZ header on redbean startup
- Track request count on redbean index page
- Report server uptime on redbean index page
- Don't bind server socket using SO_REUSEPORT
- Fix #151 where Lua LoadAsset() could free twice
- Report rusage accounting when workers exit w/ -vv
- Use ZIP iattr field as text/plain vs. binary hint
- Add ParseUrl() API for parsing things like a.href
- Add ParseParams() API for parsing HTTP POST bodies
- Add IsAcceptablePath() API for checking dots, etc.
- Add IsValidHttpToken() API for validating sane ASCII
- Add IsAcceptableHostPort() for validating HOST[:PORT]
- Send 400 response to HTTP/1.1 requests without a Host
- Send 403 response if ZIP or file isn't other readable
- Add virtual hosting that tries prepending Host to path
- Route requests based on Host in Request-URI if present
- Host routing will attempt to remove or add the www. prefix
- Sign-extend UNIX timestamps and don't adjust FileTime zone

Here's some of the improvements made to Cosmopolitan Libc:

- Fix ape.S indentation
- Improve consts.sh magnums
- Write pretty good URL parser
- Improve rusage accounting apis
- Bring mremap() closer to working
- Added ZIP APIs which will change
- Check for overflow in reallocarray()
- Remove overly fancy linkage in strerror()
- Fix GDB attach on crash w/ OpenBSD msyscall()
- Make sigqueue() portable to most UNIX distros
- Make integer serialization macros more elegant
- Bring back 34x tprecode8to16() performance boost
- Make malloc() more resilient to absurdly large sizes

libc/runtime/winmain.greg.c

@@ -160,17 +160,15 @@ static noasan textwindows wontreturn void WinMainNew(void) {
  *    able to assume that stack addresses are located at higher
  *    addresses than heap and program memory.
  *
- * 5. Windows users are afraid of "drive-by downloads" where someone
- *    might accidentally an evil DLL to their Downloads folder which
- *    then overrides the behavior of a legitimate EXE being run from
- *    the downloads folder. Since we don't even use dynamic linking,
- *    we've cargo culted some API calls, that may harden against it.
+ * 5. Reconfigure x87 FPU so long double is actually long (80 bits).
  *
- * 6. Reconfigure x87 FPU so long double is actually long (80 bits).
- *
- * 7. Finally, we need fork. Microsoft designed Windows to prevent us
- *    from having fork() so we pass pipe handles in an environment
- *    variable literally copy all the memory.
+ * 6. Finally, we need fork. Since disagreeing with fork is axiomatic to
+ *    Microsoft's engineering culture, we need to go to great lengths to
+ *    have it anyway without breaking Microsoft's rules: using the WIN32
+ *    API (i.e. not NTDLL) to copy MAP_PRIVATE pages via a pipe. It'd go
+ *    faster if the COW pages CreateFileMappingNuma claims to have turns
+ *    out to be true. Until then we have a "PC Scale" and entirely legal
+ *    workaround that they hopefully won't block using Windows Defender.
  *
  * @param hInstance call GetModuleHandle(NULL) from main if you need it
  */