Revert "meson: Add install flag for libgdbofono"

This reverts commit 3ef10bf60a.

The libgdbofono doesn't need to be installed, nor should it be at
least for now.

libgdbofono/meson.build

@@ -16,5 +16,4 @@ deps = [ dependency('gio-2.0'),
 gdbofono_lib = static_library('gdbofono',
                               gdbus_src,
                               include_directories : include_directories('..'),
-                              install: true,
                               dependencies : deps )