Make some systemic improvements

- add vdso dump utility
- tests now log stack usage
- rename g_ftrace to __ftrace
- make internal spinlocks go faster
- add conformant c11 atomics library
- function tracing now logs stack usage
- make function call tracing thread safe
- add -X unsecure (no ssl) mode to redbean
- munmap() has more consistent behavior now
- pacify fsync() calls on python unit tests
- make --strace flag work better in redbean
- start minimizing and documenting compiler flags

tool/plinko/lib/read.c

@@ -280,10 +280,10 @@ static int Read1(int fd) {
 
 int Read(int fd) {
   int r;
-  --g_ftrace;
+  --__ftrace;
   --__strace;
   r = Read1(fd);
-  ++g_ftrace;
+  ++__ftrace;
   ++__strace;
   return r;
 }