Add a build-testsuite option

This will let us run the testsuite in ci without
having to build all the manual tests.

meson.build

@@ -747,6 +747,8 @@ endif
 subdir('tools')
 if get_option('build-tests')
   subdir('tests')
+endif
+if get_option('build-testsuite')
   subdir('testsuite')
 endif
 if get_option('build-examples')

meson_options.txt

@@ -114,6 +114,11 @@ option('profile',
        value: 'default',
        description : 'Profile to use for demos')
 
+option('build-testsuite',
+       type: 'boolean',
+       value: true,
+       description : 'Build testsuite')
+
 option('build-examples',
        type: 'boolean',
        value: true,