Improve build system

- Reduce full build latency from ~20s to ~18s
- Bring back silent mode if `make V=0` is passed
- Demodernize utimes() polyfill so it works RHEL5
- Delete some old shell scripts that are no longer needed
- Truncate long lines when outputting builds to Emacs buffers

build/getcompile

@@ -5,7 +5,7 @@
 if ! [ o/build/bootstrap/compile.com -nt build/bootstrap/compile.com ]; then
   mkdir -p o/build/bootstrap/
   cp -f build/bootstrap/compile.com o/build/bootstrap/compile.$$.com
-  o/build/bootstrap/compile.$$.com --do-nothing
+  o/build/bootstrap/compile.$$.com -n
   mv -f o/build/bootstrap/compile.$$.com o/build/bootstrap/compile.com
 fi