Increase build memory quota

If you install qemu-user from apt then glibc links a lot of address
space bloat that causes pthread_create() to ENOMEM (a.k.a. EAGAIN).
Boosting the virtual memory quota from 512m to 2048m will hopefully
future proof the build for the future, as Linux distros get fatter.
Please note this only applies to MODE=aarch64 on x86_64 builds when
you're using QEMU from Debian/Ubuntu rather than installing the one
cosmo provides in third_party/qemu/qemu-aarch64.gz. This change may
also be useful to people who are using the host compiler toolchain.

tool/build/compile.c

@@ -32,7 +32,6 @@
 #include "libc/fmt/itoa.h"
 #include "libc/fmt/libgen.h"
 #include "libc/fmt/magnumstrs.internal.h"
-#include "libc/serialize.h"
 #include "libc/intrin/safemacros.internal.h"
 #include "libc/limits.h"
 #include "libc/log/appendresourcereport.internal.h"
@@ -48,6 +47,7 @@
 #include "libc/nexgen32e/x86info.h"
 #include "libc/proc/posix_spawn.h"
 #include "libc/runtime/runtime.h"
+#include "libc/serialize.h"
 #include "libc/stdio/append.h"
 #include "libc/str/str.h"
 #include "libc/sysv/consts/auxv.h"
@@ -112,9 +112,9 @@ FLAGS\n\
   -V NUMBER    specifies compiler version\n\
   -C SECS      set cpu limit [default 16]\n\
   -L SECS      set lat limit [default 90]\n\
-  -P PROCS     set pro limit [default 2048]\n\
+  -P PROCS     set pro limit [default 4096]\n\
   -S BYTES     set stk limit [default 8m]\n\
-  -M BYTES     set mem limit [default 512m]\n\
+  -M BYTES     set mem limit [default 2048m]\n\
   -F BYTES     set fsz limit [default 256m]\n\
   -O BYTES     set out limit [default 1m]\n\
   -s           decrement verbosity [default 4]\n\
@@ -845,12 +845,12 @@ int main(int argc, char *argv[]) {
 
   // parse prefix arguments
   verbose = 4;
-  timeout = 90;                 /* secs */
-  cpuquota = 32;                /* secs */
-  proquota = 2048;              /* procs */
-  stkquota = 8 * 1024 * 1024;   /* bytes */
-  fszquota = 256 * 1000 * 1000; /* bytes */
-  memquota = 512 * 1024 * 1024; /* bytes */
+  timeout = 90;                    // secs
+  cpuquota = 32;                   // secs
+  proquota = 4096;                 // procs
+  stkquota = 8 * 1024 * 1024;      // bytes
+  fszquota = 256 * 1000 * 1000;    // bytes
+  memquota = 2048L * 1024 * 1024;  // bytes
   if ((s = getenv("V"))) verbose = atoi(s);
   while ((opt = getopt(argc, argv, "hnstvwA:C:F:L:M:O:P:T:V:S:")) != -1) {
     switch (opt) {