mtools: fix "bad system call" errors

packages/mtools/build.sh

@@ -2,9 +2,9 @@ TERMUX_PKG_HOMEPAGE=https://www.gnu.org/software/mtools/
 TERMUX_PKG_DESCRIPTION="Tool for manipulating FAT images."
 TERMUX_PKG_LICENSE="GPL-2.0"
 TERMUX_PKG_VERSION=4.0.23
-TERMUX_PKG_REVISION=2
-TERMUX_PKG_SHA256=f188db26751aeb5692a79b2380b440ecc05fd1848a52f869d7ca1193f2ef8ee3
+TERMUX_PKG_REVISION=3
 TERMUX_PKG_SRCURL=https://mirrors.kernel.org/gnu/mtools/mtools-${TERMUX_PKG_VERSION}.tar.bz2
+TERMUX_PKG_SHA256=f188db26751aeb5692a79b2380b440ecc05fd1848a52f869d7ca1193f2ef8ee3
 TERMUX_PKG_DEPENDS="libandroid-support, libiconv"
 
 TERMUX_PKG_EXTRA_CONFIGURE_ARGS="

packages/mtools/no-privs.patch

@@ -0,0 +1,54 @@
+diff -uNr mtools-4.0.23/privileges.c mtools-4.0.23.mod/privileges.c
+--- mtools-4.0.23/privileges.c	2018-12-09 12:57:33.000000000 +0200
++++ mtools-4.0.23.mod/privileges.c	2020-01-10 12:49:08.689245870 +0200
+@@ -93,6 +93,9 @@
+ 
+ static __inline__ void Setuid(uid_t uid)
+ {
++#ifdef __ANDROID__
++	return;
++#endif
+ #if defined HAVE_SETEUID || defined HAVE_SETRESUID
+ 	if(euid == 0) {
+ #ifdef HAVE_SETEUID
+@@ -110,6 +113,9 @@
+ 
+ void reclaim_privs(void)
+ {
++#ifdef __ANDROID__
++	return;
++#endif
+ 	if(noPrivileges)
+ 		return;
+ 	setgid(egid);
+@@ -119,6 +125,9 @@
+ 
+ void drop_privs(void)
+ {
++#ifdef __ANDROID__
++	return;
++#endif
+ 	Setuid(ruid);
+ 	setgid(rgid);
+ 	print_privs("after drop_privs, real should be 0, effective should not ");
+@@ -126,7 +135,9 @@
+ 
+ void destroy_privs(void)
+ {
+-
++#ifdef __ANDROID__
++	return;
++#endif
+ #if defined HAVE_SETEUID || defined HAVE_SETRESUID
+ 	if(euid == 0) {
+ #ifdef HAVE_SETEUID
+@@ -159,6 +170,9 @@
+ 
+ void init_privs(void)
+ {
++#ifdef __ANDROID__
++	return;
++#endif
+ 	euid = geteuid();
+ 	ruid = getuid();
+ 	egid = getegid();