python-cython: fix check-package warnings

python-cython: fix check-package warnings

Fixes:

package/python-cython/Config.in.host:2: should be indented with one tab (http://nightly.buildroot.org/#_config_files)
package/python-cython/Config.in.host:3: should be indented with one tab (http://nightly.buildroot.org/#_config_files)
package/python-cython/Config.in.host:4: help text: <tab><2 spaces><62 chars> (http://nightly.buildroot.org/#writing-rules-config-in)
package/python-cython/Config.in.host:5: help text: <tab><2 spaces><62 chars> (http://nightly.buildroot.org/#writing-rules-config-in)

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>