shim: Build lsi-steam or not at all, depending on meson options

Signed-off-by: Ikey Doherty <ikey@solus-project.com>

src/shim/meson.build

@@ -1,15 +1,19 @@
-# TODO: Expose this as an option!
-shim_target_name = 'steam'
+if shim_behaviour == 'replacement'
+    shim_target_name = 'steam'
+else
+    shim_target_name = 'lsi-steam'
+endif
 
-shim_sources = [
-    'lsi.c',
-    'shim.c',
-]
-
-main_intercept = executable(
-    shim_target_name,
-    sources: shim_sources + nica_sources,
-    include_directories: nica_includes,
-    install: true,
-)
+if shim_behaviour != 'none'
+    shim_sources = [
+        'lsi.c',
+        'shim.c',
+    ]
 
+    shim = executable(
+        shim_target_name,
+        sources: shim_sources + nica_sources,
+        include_directories: nica_includes,
+        install: true,
+    )
+endif