Make more fixes and improvements

- Fix Makefile flaking due to ZIPOBJ_FLAGS generation
- Make printf() floating point and gdtoa thread safe
- Polish up the runit / runitd programs some more
- Prune some more makefile dependencies

third_party/gdtoa/lock.h

@@ -0,0 +1,21 @@
+#ifndef COSMOPOLITAN_THIRD_PARTY_GDTOA_LOCK_H_
+#define COSMOPOLITAN_THIRD_PARTY_GDTOA_LOCK_H_
+#include "libc/intrin/nopl.h"
+#include "libc/nexgen32e/threaded.h"
+#if !(__ASSEMBLER__ + __LINKER__ + 0)
+COSMOPOLITAN_C_START_
+
+int __gdtoa_lock(void);
+int __gdtoa_unlock(void);
+
+#if defined(__GNUC__) && !defined(__llvm__) && !defined(__STRICT_ANSI__)
+#define __gdtoa_lock()   _NOPL0("__threadcalls", __gdtoa_lock)
+#define __gdtoa_unlock() _NOPL0("__threadcalls", __gdtoa_unlock)
+#else
+#define __gdtoa_lock()   (__threaded ? __gdtoa_lock() : 0)
+#define __gdtoa_unlock() (__threaded ? __gdtoa_unlock() : 0)
+#endif
+
+COSMOPOLITAN_C_END_
+#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
+#endif /* COSMOPOLITAN_THIRD_PARTY_GDTOA_LOCK_H_ */