gplugin/gplugin

90d067db1688
Add option in meson to install helper application

Added two new options in meson that allow choosing whether the helper applications (gplugin-gtk-viewer and gplugin-query) are going to be installed or not

Testing Done:
Compiled a few times switching the two new options between true and false and verifying that the behavior was correct.

Bugs closed: GPLUGIN-129

Reviewed at https://reviews.imfreedom.org/r/159/
shared_library('basic-plugin', 'basic-plugin.c',
name_prefix : '',
dependencies : [gplugin_dep, GLIB])
shared_library('dependent-plugin', 'dependent-plugin.c',
name_prefix : '',
dependencies : [gplugin_dep, GLIB])
shared_library('broken-dependent-plugin', 'broken-dependent-plugin.c',
name_prefix : '',
dependencies : [gplugin_dep, GLIB])
shared_library('load-failed', 'load-failed.c',
name_prefix : '',
dependencies : [gplugin_dep, GLIB])
shared_library('load-exception', 'load-exception.c',
name_prefix : '',
dependencies : [gplugin_dep, GLIB])
shared_library('unload-failed', 'unload-failed.c',
name_prefix : '',
dependencies : [gplugin_dep, GLIB])