Make exciting improvements

- Add Lua backtraces to redbean!
- Wipe serving keys after redbean forks
- Audit redbean to remove free via exit
- Log SSL client ciphersuite preferences
- Increase ASAN malloc() backtrace depth
- Make GetSslRoots() behave as a singleton
- Move leaks.c from LIBC_TESTLIB to LIBC_LOG
- Add undocumented %n to printf() for newlines
- Fix redbean memory leak reindexing inode change
- Fix redbean memory leak with Fetch() DNS object
- Restore original environ after __cxa_finalize()
- Make backtrace always work after __cxa_finalize()
- Introduce COUNTEXPR() diagnostic / benchmark tool
- Fix a few more instances of errno being clobbered
- Consolidate the ANSI color disabling internal APIs

libc/log/log.mk

@@ -63,6 +63,10 @@ o/$(MODE)/libc/log/backtrace3.o:			\
 		OVERRIDE_CFLAGS +=			\
 			-fno-sanitize=all
 
+o/$(MODE)/libc/log/checkfail.o:				\
+		OVERRIDE_CFLAGS +=			\
+			-mgeneral-regs-only
+
 o/$(MODE)/libc/log/attachdebugger.o			\
 o/$(MODE)/libc/log/backtrace2.o				\
 o/$(MODE)/libc/log/backtrace3.o				\
@@ -70,7 +74,6 @@ o/$(MODE)/libc/log/checkaligned.o			\
 o/$(MODE)/libc/log/checkfail.o				\
 o/$(MODE)/libc/log/checkfail_ndebug.o			\
 o/$(MODE)/libc/log/getsymboltable.o			\
-o/$(MODE)/libc/log/cancolor.o				\
 o/$(MODE)/libc/log/restoretty.o				\
 o/$(MODE)/libc/log/oncrash.o				\
 o/$(MODE)/libc/log/onkill.o				\