Fix small matters and improve sysconf()

- Fix mkdeps.com out of memory error
- Remove static memory from __get_cpu_count()
- Add support for passing hyphen to cat in cocmd
- Change more ZipOS errors from ENOTSUP to EROFS
- Specify mem_unit in sysinfo() output on BSD OSes

examples/getcpucount.c

@@ -7,9 +7,26 @@
 │   • http://creativecommons.org/publicdomain/zero/1.0/            │
 ╚─────────────────────────────────────────────────────────────────*/
 #endif
+#include "libc/calls/calls.h"
+#include "libc/errno.h"
+#include "libc/fmt/itoa.h"
 #include "libc/intrin/kprintf.h"
 #include "libc/runtime/runtime.h"
+#include "libc/stdio/stdio.h"
+
+// this implementation uses cosmopolitan specific apis so that the
+// resulting program will be 28kb in size. the proper way to do it
+// though is use sysconf(_SC_NPROCESSORS_ONLN), which is humongous
 
 int main() {
-  kprintf("%d\n", _getcpucount());
+  int count;
+  if ((count = __get_cpu_count()) != -1) {
+    char ibuf[12];
+    FormatInt32(ibuf, count);
+    tinyprint(1, ibuf, "\n", NULL);
+    return 0;
+  } else {
+    perror("__get_cpu_count");
+    return 1;
+  }
 }