Add HTTP/HTTPS Fetch() API to redbean

You can now say the following in your redbean Lua code:

    status,headers,payload = Fetch("https://foo.example")

The following Lua APIs have been introduced:

  - Fetch(str) → str,{str:str},str
  - GetHttpReason(int) → str
  - GetHttpReason(int) → str
  - ProgramSslFetchVerify(bool)
  - ProgramSslClientVerify(bool)

The following flags have been introduced:

  - `-j` enables client SSL verification
  - `-k` disables Fetch() SSL verification
  - `-t INT` may now be passed a negative value for keepalive

Lua exceptions now invoke Cosmopolitan's garbage collector when
unwinding the stack. So it's now safe to use _gc() w/ Lua 𝔱𝔥𝔯𝔬𝔴

See #97

net/https/https.h

@@ -0,0 +1,14 @@
+#ifndef COSMOPOLITAN_NET_HTTPS_HTTPS_H_
+#define COSMOPOLITAN_NET_HTTPS_HTTPS_H_
+#include "libc/time/struct/tm.h"
+#include "third_party/mbedtls/x509_crt.h"
+#if !(__ASSEMBLER__ + __LINKER__ + 0)
+COSMOPOLITAN_C_START_
+
+char *DescribeSslVerifyFailure(int);
+mbedtls_x509_crt *GetSslRoots(void);
+void FormatSslTime(char[restrict hasatleast 16], struct tm *);
+
+COSMOPOLITAN_C_END_
+#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
+#endif /* COSMOPOLITAN_NET_HTTPS_HTTPS_H_ */