build: set CC to be clang for fuzzing
build: set CC to be clang for fuzzing

Fuzzing is clang only so set CC to be clang.
This has an effect only if CC is not set manually to something elase,
For instance to gcc.

Signed-off-by: Tadeusz Struk <ac7da5bc34fbda078ba4af5ef710d2a59a2316f5@intel.com>

01org/TPM2.0-TSS,tpm2-software/tpm2-tss,tpm2-software/tpm2-tss,01org/tpm2-tss,01org/TPM2.0-TSS,01org/tpm2-tss,01org/TPM2.0-TSS,tpm2-software/tpm2-tss,01org/TPM2.0-TSS,01org/tpm2-tss