Make test/tools/llvm-dlltool/tool-name.test pass, and make it run

The test hasn't run since it was added in D71302.

Author: nico

llvm/test/lit.cfg.py

@@ -150,7 +150,8 @@ def get_asan_rtlib():
     'dsymutil', 'lli', 'lli-child-target', 'llvm-ar', 'llvm-as',
     'llvm-addr2line', 'llvm-bcanalyzer', 'llvm-bitcode-strip', 'llvm-config', 
     'llvm-cov', 'llvm-cxxdump', 'llvm-cvtres', 'llvm-diff', 'llvm-dis', 
-    'llvm-dwarfdump', 'llvm-exegesis', 'llvm-extract', 'llvm-isel-fuzzer', 'llvm-ifs',
+    'llvm-dwarfdump', 'llvm-dlltool', 'llvm-exegesis', 'llvm-extract',
+    'llvm-isel-fuzzer', 'llvm-ifs',
     'llvm-install-name-tool', 'llvm-jitlink', 'llvm-opt-fuzzer', 'llvm-lib',
     'llvm-link', 'llvm-lto', 'llvm-lto2', 'llvm-mc', 'llvm-mca',
     'llvm-modextract', 'llvm-nm', 'llvm-objcopy', 'llvm-objdump',

llvm/test/tools/llvm-dlltool/lit.local.cfg

@@ -1 +1 @@
-config.suffixes = ['.def']
+config.suffixes.add('.def')