benchmark: replace static memory allocation with dynamic allocation in math/base/special

[sanjanadubariya2]

Description

This PR addresses the tracking issue #8643. I have replaced static array allocations with dynamic memory allocation (malloc and free) in the C benchmarks for the math/base/special directory.

Changes

• Replaced stack-allocated arrays (e.g., double x[100]) with malloc.
• Added necessary logic to check for allocation failures.
• Ensured all allocated memory is properly released using free() before function exit.
• Added #include <stdlib.h> to all modified files to support memory management functions.

Verification

• Manually verified compilation using gcc in several subdirectories (e.g., abs).
• Confirmed syntax and logic across 585 files.

Closes #8643

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[sanjanadubariya2]

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