Make improvements

This change progresses our AARCH64 support:

- The AARCH64 build and tests are now passing
- Add 128-bit floating-point support to printf()
- Fix clone() so it initializes cosmo's x28 TLS register
- Fix TLS memory layout issue with aarch64 _Alignas vars
- Revamp microbenchmarking tools so they work on aarch64
- Make some subtle improvements to aarch64 crash reporting
- Make kisdangerous() memory checks more accurate on aarch64
- Remove sys_open() since it's not available on Linux AARCH64

This change makes general improvements to Cosmo and Redbean:

- Introduce GetHostIsa() function in Redbean
- You can now feature check using pledge(0, 0)
- You can now feature check using unveil("",0)
- Refactor some more x86-specific asm comments
- Refactor and write docs for some libm functions
- Make the mmap() API behave more similar to Linux
- Fix WIFSIGNALED() which wrongly returned true for zero
- Rename some obscure cosmo keywords from noFOO to dontFOO

third_party/lua/lunix.c

@@ -16,6 +16,7 @@
 │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
+#include "third_party/lua/lunix.h"
 #include "libc/assert.h"
 #include "libc/atomic.h"
 #include "libc/calls/calls.h"
@@ -112,7 +113,6 @@
 #include "third_party/lua/lgc.h"
 #include "third_party/lua/lua.h"
 #include "third_party/lua/luaconf.h"
-#include "third_party/lua/lunix.h"
 #include "third_party/nsync/futex.internal.h"
 #include "tool/net/luacheck.h"
 
@@ -1488,7 +1488,7 @@ static int LuaUnixPledge(lua_State *L) {
   int olderr = errno;
   __pledge_mode = luaL_optinteger(L, 3, 0);
   return SysretBool(L, "pledge", olderr,
-                    pledge(luaL_checkstring(L, 1), luaL_optstring(L, 2, 0)));
+                    pledge(luaL_optstring(L, 1, 0), luaL_optstring(L, 2, 0)));
 }
 
 // sandbox.unveil([path:str[, permissions:str]])