Fix typos discovered by codespell (#2047)

% [`codespell --count --ignore-words-list=fo .`](https://pypi.org/project/codespell/)
```
./ninja/src/missing_deps.cc:119: dependecy ==> dependency
./ninja/src/includes_normalize-win32.cc:51: funcation ==> function
./ninja/src/eval_env.h:58: invokable ==> invocable
./ninja/src/missing_deps_test.cc:155: beacuse ==> because
./ninja/src/deps_log_test.cc:393: unparseable ==> unparsable
```

1 files changed, 1 insertions, 1 deletions

diff --git a/src/missing_deps.cc b/src/missing_deps.cc
index 78feb49..de76620 100644
--- a/src/missing_deps.cc
+++ b/src/missing_deps.cc
@@ -116,7 +116,7 @@ void MissingDependencyScanner::ProcessNodeDeps(Node* node, Node** dep_nodes,
     // rebuild this target when the build is reconfigured", but build.ninja is
     // often generated by a configuration tool like cmake or gn. The rest of
     // the build "implicitly" depends on the entire build being reconfigured,
-    // so a missing dep path to build.ninja is not an actual missing dependecy
+    // so a missing dep path to build.ninja is not an actual missing dependency
     // problem.
     if (deplog_node->path() == "build.ninja")
       return;