Make minor improvements

- Work towards simplifying ape.S startup process
- Rewrote ar because it took minutes to build cosmopolitan.a

libc/sysv/calls/gethostname.s

@@ -1,2 +0,0 @@
-.include "o/libc/sysv/macros.inc"
-.scall gethostname 0xffff0057ffffffff globl

libc/sysv/calls/sync-sysv.s

@@ -0,0 +1,2 @@
+.include "o/libc/sysv/macros.inc"
+.scall sync$sysv 0x00240024202400a2 globl hidden

libc/sysv/calls/sync.s

@@ -1,2 +0,0 @@
-.include "o/libc/sysv/macros.inc"
-.scall sync 0x00240024202400a2 globl