Bug: cosmocc resulting binary can't boot

### Contact Details _No response_ ### What happened? I've compiled the file vga2.c from example directory. I've tested in ARM64 and x86-64 and it works. However, even if `file` recognize it as a boot sector, `qemu-system-x86_64` doesn't boot it: This is the output after compiling: ``` ~/Test $ cosmocc vga2.c -o vga.com ~/Test $ ls *.com* vga.com vga.com.dbg ~/Test $ file vga.com vga.com: DOS/MBR boot sector; partition 1 : ID=0x7f, active, start-CHS (0x0,0,1), end-CHS (0x3ff,255,63), startsector 0, 4294967295 sectors ~/Test $ file vga.com.dbg vga.com.dbg: ELF 64-bit LSB executable, x86-64, version 1 (GNU/Linux), statically linked, with debug_info, not stripped ~/Test $ ls -lh vga.com -rwx------. 1 u0_a289 u0_a289 618K Aug 11 15:11 vga.com ``` I think the value of `sectors` have nonsense. The file vga.c can't compile, maybe is outdated: ``` ~/Test $ cosmocc ~/cosmopolitan/examples/vga.c -o vga.com /home/cosmopolitan/examples/vga.c: In function 'main': /home/cosmopolitan/examples/vga.c:58:16: error: implicit declaration of function 'readansi' [-Wimplicit-function-declaration] 58 | if ((res = readansi(0, buf, 16)) > 0) { | ^~~~~~~~ ~/Test $ ``` ### Version cosmocc (GCC) 14.1.0 ### What operating system are you seeing the problem on? BIOS ### Relevant log output ```shell ```