package/tio: disable for sparc and sparc64 architectures

tio fails to build on sparc and sparc64 architectures with a
redefinition of 'struct termio' error, with no proper fix or workaround
for now. See discussions in [1] and [2] and picocom source code in [3].

[1] http://patchwork.ozlabs.org/project/buildroot/patch/20191227204520.1500501-1-fontaine.fabrice@gmail.com/
[2] http://patchwork.ozlabs.org/project/buildroot/patch/20200511142602.46170-1-vadim4j@gmail.com/
[3] https://github.com/npat-efault/picocom/blob/master/termbits2.h#L37

So let's disable it for now on sparc and sparc64 architectures.

Fixes:
http://autobuild.buildroot.org/results/e041dde522e2a774f528d4377f67ca0a8a99461c
http://autobuild.buildroot.org/results/6e1f9fe47e8b2cfdf5effcb7bbc697189f54ff2c
http://autobuild.buildroot.org/results/49708fe6f404fea6761f102af854e98d6a1d43c1
Many more...

Signed-off-by: Sergio Prado <sergio.prado@e-labworks.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/tio/Config.in

@@ -1,8 +1,15 @@
 config BR2_PACKAGE_TIO
 	bool "tio"
+	depends on !BR2_sparc64 && !BR2_sparc
 	help
 	  "tio" is a simple TTY terminal application which features a
 	  straightforward commandline interface to easily connect to
 	  TTY devices for basic input/output.
 
 	  https://tio.github.io/
+
+# tio is disabled for sparc and sparc64 architectures because it fails
+# to build with a redefinition of 'struct termio' error, with no proper
+# fix or workaround for now
+comment "tio is disabled for sparc and sparc64 architectures"
+	depends on BR2_sparc64 || BR2_sparc