Provide a variant of the CALL macro which doesn't use the nested functions GNU C extension.
Provide a variant of the CALL macro which doesn't use the nested functions GNU C extension.

This is useful when building with compilers like clang+llvm which do not
plan on implementing this extension.

Signed-off-by: Rémi Denis-Courmont <f0699137713be92736351a0674e79536595e4a60@remlab.net>

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