Fixed findings

List of Findings

Error: CLIPPY_WARNING: [#def1]
src/ffi.rs:27:24: warning: `extern` declarations without an explicit ABI are deprecated
#     |
#  27 |     c_api_free: unsafe extern fn(*mut c_void),
#     |                        ^^^^^^ help: explicitly specify the "C" ABI: `extern "C"`
#     |
#     = note: `#[warn(missing_abi)]` on by default

Error: CLIPPY_WARNING: [#def2]
src/ffi.rs:34:24: warning: `extern` declarations without an explicit ABI are deprecated
#     |
#  34 |     c_api_free: unsafe extern fn(*mut c_void),
#     |                        ^^^^^^ help: explicitly specify the "C" ABI: `extern "C"`

Error: CLIPPY_WARNING: [#def3]
src/ffi.rs:428:85: warning: `extern` declarations without an explicit ABI are deprecated
#      |
#  428 | pub extern "C" fn liq_attr_create_with_allocator(_unused: *mut c_void, free: unsafe extern fn(*mut c_void)) -> Option<Box<liq_attr>> {
#      |                                                                                     ^^^^^^ help: explicitly specify the "C" ABI: `extern "C"`

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