capture: avoid GObject in libsysprof-capture-2.a

The point of this file was to be easily usable by applications that want
to generate capture files (or proxy them). The intention here is that we
only have SpCaptureReader/SpCaptureWriter (and associated bits necessary
to support that).

This makes sure that we do not use GObject from the libsysprof-capture-2.a
while still having GType's in the libsysprof-2.so dynamic library.

We also invert the GObject macro check so that the default is to not
register a GType which increases the chances that copy/paste code does
not run into double-registering a GType if used with an application that
links against libsysprof-2. (One such example could be if Gtk uses this
code for timers, as it would break Sysprof itself).

tools/meson.build

@@ -1,9 +1,9 @@
 sysprof_cli = executable('sysprof-cli',
   'sysprof-cli.c',
   dependencies: libsysprof_dep,
-  c_args: exe_c_args,
-  link_args: exe_link_args,
-  install: true,
+        c_args: exe_c_args,
+     link_args: exe_link_args,
+       install: true,
 )
 
 sysprof_cat = executable('sysprof-cat', 'sysprof-cat.c',
@@ -15,6 +15,6 @@ sysprof_cat = executable('sysprof-cat', 'sysprof-cat.c',
 sysprof_dump = executable('sysprof-dump',
   'sysprof-dump.c',
   dependencies: libsysprof_capture_dep,
-  c_args: exe_c_args,
-  link_args: exe_link_args,
+        c_args: exe_c_args,
+     link_args: exe_link_args,
 )