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

libc/integral/normalize.inc

@@ -50,6 +50,9 @@
 #ifndef __has_cpp_attribute
 #define __has_cpp_attribute(x) 0
 #endif
+#ifndef __has_extension
+#define __has_extension(x) 0
+#endif
 
 #ifdef unix
 #undef unix