Fix types.h for MSVC6.0

[embhorn]

Description

MSVC6 does not have the "long long" data type. However, MSVC6 does have built-in support for __int64 and unsigned __int64. Windows.h is not necessary for this.

Fixes zd19742

Testing

Customer conifirmed

Checklist

• added tests
• updated/added doxygen
• updated appropriate READMEs
• Updated manual and documentation

[Copilot]

Pull Request Overview

This PR updates wolfssl/wolfcrypt/types.h to support MSVC6.0 by replacing the "long long" data type with MSVC6.0’s native __int64 types.

• Added an explicit condition for MSVC6.0 using (_MSC_VER == 1200).
• Retained existing checks for other MSVC versions and compilers.

Comments suppressed due to low confidence (1)

wolfssl/wolfcrypt/types.h:255

• [nitpick] Consider enhancing the inline comment to clarify why MSVC6.0 is treated separately, ensuring the rationale is immediately clear to maintainers.

#if (defined(_MSC_VER) && (_MSC_VER == 1200)) ||  /* MSVC6 */ \

[embhorn]

Retest this please

https://cloud.wolfssl-test.com/jenkins/job/PRB-generic-config-parser/8120/
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