patch for building x86_64 gcc 9.2.0 & 9.4.0 on M1

By @jannau in richfelker#116.

patches/gcc-9.2.0/0020-apple-silicon.diff

@@ -0,0 +1,18 @@
+diff -ru a/gcc/config/host-darwin.c b/gcc/config/host-darwin.c
+--- a/gcc/config/host-darwin.c   2019-01-01 13:31:55.000000000 +0100
++++ b/gcc/config/host-darwin.c   2021-08-07 19:21:05.000000000 +0200
+@@ -22,6 +22,8 @@
+ #include "coretypes.h"
+ #include "diagnostic-core.h"
+ #include "config/host-darwin.h"
++#include "hosthooks.h"
++#include "hosthooks-def.h"
+
+ /* Yes, this is really supposed to work.  */
+ static char pch_address_space[1024*1024*1024] __attribute__((aligned (4096)));
+@@ -75,3 +77,5 @@
+
+   return ret;
+ }
++
++const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER;

patches/gcc-9.4.0/0020-apple-silicon.diff

@@ -0,0 +1,18 @@
+diff -ru a/gcc/config/host-darwin.c b/gcc/config/host-darwin.c
+--- a/gcc/config/host-darwin.c	2021-06-01 09:53:04.000000000 +0200
++++ b/gcc/config/host-darwin.c	2021-08-07 19:07:29.000000000 +0200
+@@ -22,6 +22,8 @@
+ #include "coretypes.h"
+ #include "diagnostic-core.h"
+ #include "config/host-darwin.h"
++#include "hosthooks.h"
++#include "hosthooks-def.h"
+
+ /* Yes, this is really supposed to work.  */
+ /* This allows for a pagesize of 16384, which we have on Darwin20, but should
+@@ -78,3 +80,5 @@
+
+   return ret;
+ }
++
++const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER;