build(options): Options propegate much more reliably

Build options such as build-python and build-fortran have much more
predicatable and sensible behavior

build-config/fourdst/meson.build

@@ -1,13 +1,20 @@
 # bring in all of the fourdst utility repositories
 
-fourdst_sp = subproject('fourdst')
+fourdst_sp = subproject('fourdst',
+                        default_options:
+                            ['build-tests=' + get_option('build-tests').to_string(),
+                             'build-python=' + get_option('build-python').to_string()
+                            ]
+)
 
 composition_dep = fourdst_sp.get_variable('composition_dep')
 log_dep = fourdst_sp.get_variable('log_dep')
 const_dep = fourdst_sp.get_variable('const_dep')
 config_dep = fourdst_sp.get_variable('config_dep')
+plugin_dep = fourdst_sp.get_variable('plugin_dep')
 
 libcomposition = fourdst_sp.get_variable('libcomposition')
 libconst = fourdst_sp.get_variable('libconst')
 libconfig = fourdst_sp.get_variable('libconfig')
-liblogging = fourdst_sp.get_variable('liblogging')
+liblogging = fourdst_sp.get_variable('liblogging')
+libplugin = fourdst_sp.get_variable('libplugin')

build-config/libplugin/meson.build

@@ -1,5 +0,0 @@
-libplugin_sp = subproject('libplugin')
-
-plugin_dep = libplugin_sp.get_variable('plugin_dep')
-libplugin = libplugin_sp.get_variable('libplugin')
-

build-config/meson.build

@@ -1,7 +1,6 @@
 cmake = import('cmake')
 
 subdir('fourdst')
-subdir('libplugin')
 
 subdir('sundials')