Protect std::max against macro definitions

Fixes #150.

Author: zauguin

hdr/sqlite_modern_cpp/utility/utf16_utf8.h

@@ -11,7 +11,7 @@ namespace sqlite {
 			struct : std::codecvt<char16_t, char, std::mbstate_t> {
 			} codecvt;
 			std::mbstate_t state;
-			std::string result(std::max(input.size() * 3 / 2, std::size_t(4)), '\0');
+			std::string result((std::max)(input.size() * 3 / 2, std::size_t(4)), '\0');
 			const char16_t *remaining_input = input.data();
 			std::size_t produced_output = 0;
 			while(true) {
@@ -32,7 +32,7 @@ namespace sqlite {
 					produced_output = used_output - result.data();
 					result.resize(
 							result.size()
-							+ std::max((&input[input.size()] - remaining_input) * 3 / 2,
+							+ (std::max)((&input[input.size()] - remaining_input) * 3 / 2,
 							           std::ptrdiff_t(4)));
 				}
 			}