gplugin/gplugin

Print out the error if testing for lgi failed.

2021-03-11, Elliott Sales de Andrade
2dedd64d03b9
Print out the error if testing for lgi failed.

This will be swallowed by Meson, so is not noisy, but will appear in the logs
for easier debugging.

Testing Done:
Compiled in mingw, which has some path issues with Lua, which can now be found in the error in the logs.

Reviewed at https://reviews.imfreedom.org/r/569/
option(
'doc',
type : 'boolean', value : true, yield : true,
description : 'build documentation with gtk-doc'
)
option(
'introspection',
type : 'boolean', value : true, yield : true,
description : 'Whether or not to build a GObject Introspection type library'
)
option(
'gtk3',
type : 'boolean', value : true,
description : 'Whether or not to build the gtk3 library'
)
option(
'help2man',
type : 'boolean', value : true,
description : 'Whether or not to build man pages from --help output'
)
option(
'install-gplugin-gtk-viewer',
type : 'boolean', value : true,
description : 'Whether or not to install the gtk viewer application'
)
option(
'install-gplugin-query',
type : 'boolean', value : true,
description : 'Whether or not to install the query application'
)
option(
'lua',
type : 'boolean', value : true,
description : 'Whether or not to build the Lua plugin loader'
)
option(
'nls',
type : 'boolean', value : true,
description : 'Install translation files'
)
option(
'perl5',
type : 'boolean', value : true,
description : 'Whether or not to build the Perl plugin loader'
)
option(
'python3',
type : 'boolean', value : true,
description : 'Whether or not to build the Python 3.x plugin loader'
)
option(
'tcc',
type : 'boolean', value : false,
description : 'Whether or not to build the TCC plugin loader'
)
option(
'vapi',
type : 'boolean', value : true,
description : 'Whether or not to build vapi files for gplugin'
)