mark parsertests with option 'texvc'

One of the parsertests had the option 'texvc', that is a nice idea to
let MediaWiki recognize such test is requiring a texvc installation.
This patch apply the option to all those parser tests.

MediaWiki core change https://gerrit.wikimedia.org/r/69872 will
recognize the option and skip the test whenever $wgTexvc is not set or
points to a non executable file.

Also cleaned out some blank lines.

bug: 49884
Change-Id: I746856be4aafa8e8ed5ef33d5b10b16db3ca97ff
Merge "mark parsertests with option 'texvc'"