valgrind: Fix arm build by avoiding -mthumb

packages/valgrind/build.sh

@@ -11,8 +11,12 @@ TERMUX_PKG_BLACKLISTED_ARCHES="x86_64"
 # "error: the clang compiler does not support '-mcpu=cortex-a8'":
 TERMUX_PKG_CLANG=no
 
-if [ "$TERMUX_ARCH" == "arm" ]; then
-	# valgrind doesn't like arm; armv7 works, though.
-	TERMUX_PKG_EXTRA_CONFIGURE_ARGS+=" --host=armv7-linux-androideabi"
-fi
-
+termux_step_pre_configure() {
+	if [ "$TERMUX_ARCH" == "arm" ]; then
+		# valgrind doesn't like arm; armv7 works, though.
+		TERMUX_PKG_EXTRA_CONFIGURE_ARGS+=" --host=armv7-linux-androideabi"
+		# http://lists.busybox.net/pipermail/buildroot/2013-November/082270.html:
+		# "valgrind uses inline assembly that is not Thumb compatible":
+		CFLAGS=${CFLAGS/-mthumb/}
+	fi
+}