package/tio: needs threads

tio needs threads since version 2.4 and
https://github.com/tio/tio/commit/93e6efc00153e625e4ceb8a51e01b324247d312a
resulting in the following build failure since bump to version 2.7 in
commit 4b33d7a47dd41fed5364a398320c2b7d0687ba5e:

In file included from /home/autobuild/autobuild/instance-7/output-1/host/riscv64-buildroot-linux-uclibc/sysroot/usr/include/stdio.h:27,
                 from ../src/tty.c:23:
/home/autobuild/autobuild/instance-7/output-1/host/riscv64-buildroot-linux-uclibc/sysroot/usr/include/features.h:218:5: warning: #warning requested reentrant code, but thread support was disabled [-Wcpp]
  218 | #   warning requested reentrant code, but thread support was disabled
      |     ^~~~~~~
../src/tty.c:43:10: fatal error: pthread.h: No such file or directory
   43 | #include <pthread.h>
      |          ^~~~~~~~~~~

Fixes: 4b33d7a47dd41fed5364a398320c2b7d0687ba5e
 - http://autobuild.buildroot.org/results/9b20ff06a0ad24b7e7f4750ebe64e2077e36164a

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/tio/Config.in

@@ -1,6 +1,7 @@
 config BR2_PACKAGE_TIO
 	bool "tio"
 	depends on !BR2_sparc64 && !BR2_sparc
+	depends on BR2_TOOLCHAIN_HAS_THREADS
 	select BR2_PACKAGE_INIH
 	help
 	  "tio" is a simple TTY terminal application which features a
@@ -14,3 +15,7 @@ config BR2_PACKAGE_TIO
 # fix or workaround for now
 comment "tio is disabled for sparc and sparc64 architectures"
 	depends on BR2_sparc64 || BR2_sparc
+
+comment "tio needs a toolchain w/ threads"
+	depends on !BR2_sparc64 && !BR2_sparc
+	depends on !BR2_TOOLCHAIN_HAS_THREADS