busybox: Fix less and build with clang on arm

Patch less in a similar manner as svlogd.

packages/busybox/build-with-clang.patch

@@ -0,0 +1,22 @@
+svlogd, less (and others?) don't work with clang.
+Patch inspired by http://landley.net/mantis/mantis-2344.html
+--- ../svlogd.c.orig	2018-06-07 19:34:47.442867090 +0000
++++ ./runit/svlogd.c	2018-06-07 19:35:16.438776951 +0000
+@@ -244,6 +244,7 @@
+ #define INIT_G() do { \
+ 	setup_common_bufsiz(); \
+ 	SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
++	asm volatile("":::"memory"); \
+ 	linemax = 1000; \
+ 	/*buflen = 1024;*/ \
+ 	linecomplete = 1; \
+--- ../less.c.orig	2018-06-07 20:50:47.743373352 +0000
++++ ./miscutils/less.c	2018-06-07 20:51:31.467242215 +0000
+@@ -253,6 +253,7 @@
+ #define kbd_input           (G.kbd_input         )
+ #define INIT_G() do { \
+ 	SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
++	asm volatile("":::"memory"); \
+ 	less_gets_pos = -1; \
+ 	empty_line_marker = "~"; \
+ 	num_files = 1; \

packages/busybox/build.sh

@@ -6,9 +6,6 @@ TERMUX_PKG_REVISION=1
 TERMUX_PKG_SHA256=e3c14a3699dc7e82fed397392957afc78e37bdf25398ac38ead6e84621b2ae6a
 TERMUX_PKG_SRCURL=https://busybox.net/downloads/busybox-${TERMUX_PKG_VERSION}.tar.bz2
 TERMUX_PKG_BUILD_IN_SRC=yes
-if [ $TERMUX_ARCH = arm ]; then
-	TERMUX_PKG_CLANG=no
-fi
 
 # We replace env in the old coreutils package:
 TERMUX_PKG_CONFLICTS="coreutils (<< 8.25-4)"

packages/busybox/svlogd.c.patch

@@ -1,12 +0,0 @@
-svlogd doesn't work with clang.
-Patch inspired by http://landley.net/mantis/mantis-2344.html
---- ../svlogd.c.orig	2018-06-07 19:34:47.442867090 +0000
-+++ ./runit/svlogd.c	2018-06-07 19:35:16.438776951 +0000
-@@ -244,6 +244,7 @@
- #define INIT_G() do { \
- 	setup_common_bufsiz(); \
- 	SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
-+	asm volatile("":::"memory"); \
- 	linemax = 1000; \
- 	/*buflen = 1024;*/ \
- 	linecomplete = 1; \