Guard against min/max being macros in reader.h

Sometimes, particularly when Microsoft's windows.h is included, min/max
are defined as macros, interfering with use of
std::numeric_limits::min() and the like.

To guard against this, the function name is wrapped in an extra set of
parenthesis, which inhibits function-style macro expansion.

This is a similar commit to 6e38649e, but fixes uses of
std::numeric_limits added after that commit, like those introduced in
2ea43433.

include/rapidjson/reader.h

@@ -1701,7 +1701,7 @@ private:
                    d = internal::StrtodNormalPrecision(d, p);
 
                // Use > max, instead of == inf, to fix bogus warning -Wfloat-equal
-               if (d > std::numeric_limits<double>::max()) {
+               if (d > (std::numeric_limits<double>::max)()) {
                    // Overflow
                    // TODO: internal::StrtodX should report overflow (or underflow)
                    RAPIDJSON_PARSE_ERROR(kParseErrorNumberTooBig, startOffset);

test/unittest/itoatest.cpp

@@ -79,12 +79,12 @@ static void Verify(void(*f)(T, char*), char* (*g)(T, char*)) {
         do {
             VerifyValue<T>(i - 1, f, g);
             VerifyValue<T>(i, f, g);
-            if (std::numeric_limits<T>::min() < 0) {
+            if ((std::numeric_limits<T>::min)() < 0) {
                 VerifyValue<T>(Traits<T>::Negate(i), f, g);
                 VerifyValue<T>(Traits<T>::Negate(i + 1), f, g);
             }
             last = i;
-            if (i > static_cast<T>(std::numeric_limits<T>::max() / static_cast<T>(power)))
+            if (i > static_cast<T>((std::numeric_limits<T>::max)() / static_cast<T>(power)))
                 break;
             i *= static_cast<T>(power);
         } while (last < i);

test/unittest/readertest.cpp

@@ -422,7 +422,7 @@ static void TestParseDouble() {
             "67546703537516986049910576551282076245490090389328944075868508455133942"
             "30458323690322294816580855933212334827479782620414472316873817718091929"
             "9881250404026184124858368",
-            std::numeric_limits<double>::max());
+            (std::numeric_limits<double>::max)());
 
         TEST_DOUBLE(fullPrecision,
             "243546080556034731077856379609316893158278902575447060151047"