emacs: disable fdsan

https://github.com/termux/termux-packages/issues/6592

packages/emacs/build.sh

@@ -3,6 +3,7 @@ TERMUX_PKG_DESCRIPTION="Extensible, customizable text editor-and more"
 TERMUX_PKG_LICENSE="GPL-3.0"
 TERMUX_PKG_MAINTAINER="@termux"
 TERMUX_PKG_VERSION=27.2
+TERMUX_PKG_REVISION=1
 TERMUX_PKG_SRCURL=https://ftp.gnu.org/gnu/emacs/emacs-${TERMUX_PKG_VERSION}.tar.xz
 TERMUX_PKG_SHA256=b4a7cc4e78e63f378624e0919215b910af5bb2a0afc819fad298272e9f40c1b9
 TERMUX_PKG_DEPENDS="ncurses, gnutls, libxml2"

packages/emacs/disable-fdsan.patch

@@ -0,0 +1,34 @@
+diff -uNr emacs-27.2/src/emacs.c emacs-27.2.mod/src/emacs.c
+--- emacs-27.2/src/emacs.c	2021-01-28 19:52:38.000000000 +0200
++++ emacs-27.2.mod/src/emacs.c	2021-04-10 17:04:56.744343967 +0300
+@@ -120,6 +120,11 @@
+ #include "pdumper.h"
+ #include "epaths.h"
+ 
++#ifdef __ANDROID__
++#include <android/fdsan.h>
++#include <dlfcn.h>
++#endif
++
+ static const char emacs_version[] = PACKAGE_VERSION;
+ static const char emacs_copyright[] = COPYRIGHT;
+ static const char emacs_bugreport[] = PACKAGE_BUGREPORT;
+@@ -954,6 +959,18 @@
+   /* Record (approximately) where the stack begins.  */
+   stack_bottom = (char *) &stack_bottom_variable;
+ 
++#ifdef __ANDROID__
++  // For Android 11+.
++  void *lib_handle = dlopen("libc.so", RTLD_LAZY);
++  if (lib_handle) {
++    void (*set_fdsan_error_level)(enum android_fdsan_error_level newlevel) = dlsym(lib_handle, "android_fdsan_set_error_level");
++    if (set_fdsan_error_level) {
++      set_fdsan_error_level(ANDROID_FDSAN_ERROR_LEVEL_DISABLED);
++    }
++    dlclose(lib_handle);
++  }
++#endif
++
+   const char *dump_mode = NULL;
+   int skip_args = 0;
+   char *temacs = NULL;