Since ES6 there's no reason to use `underscore`s map and filter (#5989)gh-10149

Mindless replacements of the form 
`_.filter(options, option =>...`  --> `options.filter(option =>...`.

One not *entirely* mindless replacement at the bottom of
compiler-dropin-tool.ts :
```
-        return _.filter(pathFilteredFlags) as string[];
+        return pathFilteredFlags.filter(Boolean) as string[];
```
6 files can now stop importing underscore.

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/compilers/tinyc.ts b/lib/compilers/tinyc.ts
index 73ee8817b..7972f4805 100644
--- a/lib/compilers/tinyc.ts
+++ b/lib/compilers/tinyc.ts
@@ -45,6 +45,6 @@ export class TinyCCompiler extends BaseCompiler {
     }
 
     override filterUserOptions(userOptions) {
-        return _.filter(userOptions, opt => opt !== '-run');
+        return userOptions.filter(opt => opt !== '-run');
     }
 }