proot: Upgrade to fix #898 (#915)

Also revert to thumb mode as termux/proot#1 is fixed

packages/proot/build.sh

@@ -1,21 +1,15 @@
 TERMUX_PKG_HOMEPAGE=http://proot.me/
 TERMUX_PKG_DESCRIPTION="Emulate chroot, bind mount and binfmt_misc for non-root users"
 # Just bump commit and version when needed:
-_COMMIT=9fc1f2db56712f1bee38b568f5d4cf862763fd88
-TERMUX_PKG_VERSION=5.1.103
+_COMMIT=edc869d60c7f5b6abf67052a327ef099aded7777
+TERMUX_PKG_VERSION=5.1.104
 TERMUX_PKG_SRCURL=https://github.com/termux/proot/archive/${_COMMIT}.zip
-TERMUX_PKG_SHA256=719cf15807f81dd4c5911ce1955458a68f0d4b39a27fdfecdb4c1bef1f6c867d
+TERMUX_PKG_SHA256=3b1a579a108c17e897ef8da02ed7af8d77000c5d9946ed72f113f87ce61f5637
 TERMUX_PKG_FOLDERNAME=proot-$_COMMIT
 TERMUX_PKG_DEPENDS="libtalloc"
 
 termux_step_pre_configure() {
 	export LD=$CC
-	if [ $TERMUX_ARCH=arm ]; then
-		# XXX: Building with -mthumb, which Termux does by
-		# default on arm, see:
-		# https://github.com/termux/termux-packages/issues/761
-		CFLAGS="${CFLAGS/-mthumb/}"
-	fi
 }
 
 termux_step_make_install () {