Fix c_char type

[ods]

libpg_query::PgQueryError::message is declared as c_char, not i8. This causes error when building squawk on platforms where c_char is u8:

   Compiling squawk-parser v0.0.0 (/src/origin/parser)
error[E0308]: mismatched types======>  ] 280/292: openssl-sys(build), squawk-parser
  --> parser/src/parse.rs:12:38
   |
12 |         unsafe { Some(CStr::from_ptr(str_ptr).to_string_lossy().into()) }
   |                       -------------- ^^^^^^^ expected `u8`, found `i8`
   |                       |
   |                       arguments to this function are incorrect
   |
   = note: expected raw pointer `*const u8`
              found raw pointer `*mut i8`
note: associated function defined here
  --> /rustc/fc594f15669680fa70d255faec3ca3fb507c3405/library/core/src/ffi/c_str.rs:256:25


error[E0308]: mismatched types======>  ] 280/292: openssl-sys(build), squawk-parser
  --> parser/src/parse.rs:26:69
   |
26 |             return Err(PgQueryError::PgParseError(parse_str_or_none(err.message)));
   |                                                   ----------------- ^^^^^^^^^^^ expected `i8`, found `u8`
   |                                                   |
   |                                                   arguments to this function are incorrect
   |
   = note: expected raw pointer `*mut i8`
              found raw pointer `*mut u8`
note: function defined here
  --> parser/src/parse.rs:8:4
   |
8  | fn parse_str_or_none(str_ptr: *mut i8) -> Option<String> {
   |    ^^^^^^^^^^^^^^^^^ ----------------


error: aborting due to 2 previous errors 280/292: openssl-sys(build), squawk-parser


For more information about this error, try `rustc --explain E0308`.

error: could not compile `squawk-parser` due to 3 previous errors

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[sbdchd]

Ty!