meson: Rename 'tests' option to 'test'

The 'tests' option enables compilation of tests. On Gentoo and Chrome
OS, the corresponding package USE flag is named 'test'. Rename the
option to 'test' to bring it in line.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>

meson.build

@@ -73,7 +73,7 @@ if get_option('documentation')
     subdir('Documentation')
 endif
 
-if get_option('tests')
+if get_option('test')
     subdir('test')
 endif
 

meson_options.txt

@@ -7,6 +7,6 @@ option('documentation',
         type : 'boolean',
         description : 'Generate the project documentation')
 
-option('tests',
+option('test',
         type : 'boolean',
         description: 'Compile and include the tests')