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

examples/touch.c

@@ -0,0 +1,29 @@
+#if 0
+/*─────────────────────────────────────────────────────────────────╗
+│ To the extent possible under law, Justine Tunney has waived      │
+│ all copyright and related or neighboring rights to this file,    │
+│ as it is written in the following disclaimers:                   │
+│   • http://unlicense.org/                                        │
+│   • http://creativecommons.org/publicdomain/zero/1.0/            │
+╚─────────────────────────────────────────────────────────────────*/
+#endif
+#include "libc/calls/calls.h"
+#include "libc/errno.h"
+#include "libc/runtime/runtime.h"
+#include "libc/stdio/stdio.h"
+#include "libc/str/str.h"
+
+/**
+ * @fileoverview Command for updating timestamps on files.
+ */
+
+int main(int argc, char *argv[]) {
+  int i;
+  for (i = 1; i < argc; ++i) {
+    if (touch(argv[i], 0644) == -1) {
+      fprintf(stderr, "ERROR: %s: %s\n", argv[i], strerror(errno));
+      exit(1);
+    }
+  }
+  return 0;
+}