don't check for musl toolkit when running zig, add -static to ncurses

src/SPC/builder/unix/library/ncurses.php

@@ -14,6 +14,9 @@ trait ncurses
         $filelist = FileSystem::scanDirFiles(BUILD_BIN_PATH, relative: true);
 
         UnixAutoconfExecutor::create($this)
+            ->appendEnv([
+                'LDFLAGS' => getenv('SPC_LIBC') === 'musl' ? '-static' : ''
+            ])
             ->configure(
                 '--enable-overwrite',
                 '--with-curses-h',
@@ -22,6 +25,7 @@ trait ncurses
                 '--disable-widec',
                 '--with-normal',
                 '--with-ticlib',
+                '--with-pthread',
                 '--without-tests',
                 '--without-dlsym',
                 '--without-debug',