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/zig.ts b/lib/compilers/zig.ts
index b0d55432b..e01808e57 100644
--- a/lib/compilers/zig.ts
+++ b/lib/compilers/zig.ts
@@ -175,7 +175,7 @@ export class ZigCompiler extends BaseCompiler {
 
     override filterUserOptions(userOptions: string[]): string[] {
         const forbiddenOptions = /^(((--(cache-dir|name|output|verbose))|(-(mllvm|f(no-)?emit-))).*)$/;
-        return _.filter(userOptions, option => !forbiddenOptions.test(option));
+        return userOptions.filter(option => !forbiddenOptions.test(option));
     }
 
     override isCfgCompiler(/*compilerVersion*/): boolean {