BPF C functions always inlined wastes space

[jackcmay]

Problem

All BPF C functions are currently inlined which wastes space

Proposed Solution

Remove Solana function prefix:
#define SOL_FN_PREFIX __attribute__((always_inline)) static
Or, at least redefine to remove inlining:
#define SOL_FN_PREFIX static

Depends on:

• BPF missing support for 'call' instructions with a relative instruction offset #2260
• BPF implementation does not support BPF to BPF function calls #2086
• The Solana C SDK function `sol_deserialize' takes more parameters than BPF can support #2420

[jackcmay]

This is an optimization and lower priority and not critical for Beacons, removing the Beacons Milestone