build: replace kwargs in CustomTarget initializer

Because we don't want to pass the Interpreter kwargs into the build
layer. This turned out to be a mega commit, as there's really on elegant
way to make this change in an incremental way. On the nice side, mypy
made this change super easy, as nearly all of the calls to
`CustomTarget` are fully type checked!

It also turns out that we're not handling install_tags in custom_target
correctly, since we're not converting the boolean values into Optional
values!

1 files changed, 1 insertions, 1 deletions

diff --git a/test cases/failing/41 custom target plainname many inputs/test.json b/test cases/failing/41 custom target plainname many inputs/test.json
index 8c15cda..66a56f6 100644
--- a/test cases/failing/41 custom target plainname many inputs/test.json
+++ b/test cases/failing/41 custom target plainname many inputs/test.json
@@ -1,7 +1,7 @@
 {
   "stdout": [
     {
-      "line": "test cases/failing/41 custom target plainname many inputs/meson.build:5:0: ERROR: Output cannot contain @PLAINNAME@ or @BASENAME@ when there is more than one input (we can't know which to use)"
+      "line": "test cases/failing/41 custom target plainname many inputs/meson.build:5:0: ERROR: custom_target: output cannot containe \"@PLAINNAME@\" or \"@BASENAME@\" when there is more than one input (we can't know which to use)"
     }
   ]
 }