[NFC] Normalize some test 'main' signatures

There were 3 tests with 'int main(void)', and 6 with the return type on a different line. I'm about to send a patch for main in tests, and this NFC change is unrelated.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@350770 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/containers/unord/unord.map/compare.pass.cpp

@@ -33,8 +33,7 @@ namespace std
     };
 }
 
-int
+int main()
-main()
 {
     typedef std::unordered_map<Key, int> MapT;
     typedef MapT::iterator Iter;

test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.arithmetic/minmax_showbase.pass.cpp

@@ -46,7 +46,7 @@ static void test(std::ios_base::fmtflags fmt, const char *expected)
     assert(ss.str() == expected);
 }
 
-int main(void)
+int main()
 {
     const std::ios_base::fmtflags o = std::ios_base::oct;
     const std::ios_base::fmtflags d = std::ios_base::dec;

test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/test_min_max.pass.cpp

@@ -52,7 +52,7 @@ void check_limits()
     }
 }
 
-int main(void)
+int main()
 {
     check_limits<short>();
     check_limits<unsigned short>();

test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/test_neg_one.pass.cpp

@@ -149,7 +149,7 @@ void test_negate() {
     }
 }
 
-int main(void)
+int main()
 {
     test_neg_one<long>();
     test_neg_one<long long>();

test/std/re/re.alg/re.alg.match/parse_curly_brackets.pass.cpp

@@ -63,8 +63,7 @@ test4()
     assert((std::regex_match(target, smatch, regex)));
 }
 
-int
+int main()
-main()
 {
     test1();
     test2();

test/std/utilities/charconv/charconv.from.chars/integral.pass.cpp

@@ -184,8 +184,7 @@ struct test_signed : roundtrip_test_base<T>
     }
 };
 
-int
+int main()
-main()
 {
     run<test_basics>(integrals);
     run<test_signed>(all_signed);

test/std/utilities/charconv/charconv.to.chars/integral.pass.cpp

@@ -82,8 +82,7 @@ struct test_signed : to_chars_test_base<T>
     }
 };
 
-int
+int main()
-main()
 {
     run<test_basics>(integrals);
     run<test_signed>(all_signed);

test/std/utilities/function.objects/bind/func.bind/func.bind.bind/nested.pass.cpp

@@ -42,8 +42,7 @@ struct plus_one
   }
 };
 
-int
+int main()
-main()
 {
     using std::placeholders::_1;
 

test/std/utilities/tuple/tuple.tuple/TupleFunction.pass.cpp

@@ -26,8 +26,7 @@ struct X
     void operator()() {}
 };
 
-int
+int main()
-main()
 {
     X x;
     std::function<void()> f(x);