Get codebase completely working with LLVM

You can now build Cosmopolitan with Clang:

    make -j8 MODE=llvm
    o/llvm/examples/hello.com

The assembler and linker code is now friendly to LLVM too.
So it's not needed to configure Clang to use binutils under
the hood. If you love LLVM then you can now use pure LLVM.

libc/sock/connect-sysv.c

@@ -16,6 +16,7 @@
 │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/assert.h"
 #include "libc/dce.h"
 #include "libc/sock/internal.h"
 #include "libc/str/str.h"
@@ -27,8 +28,7 @@ int sys_connect(int fd, const void *addr, uint32_t addrsize) {
     return __sys_connect(fd, addr, addrsize);
   } else {
     struct sockaddr_in_bsd addr2;
-    _Static_assert(sizeof(struct sockaddr_in) ==
-                   sizeof(struct sockaddr_in_bsd));
+    assert(sizeof(struct sockaddr_in) == sizeof(struct sockaddr_in_bsd));
     memcpy(&addr2, addr, sizeof(struct sockaddr_in));
     sockaddr2bsd(&addr2);
     return sys_connect(fd, &addr2, addrsize);