POSIX says FILE is a typedef to a structure containing information about
a file. The structure is unspecified, i.e. it may be an incomplete type, as is the case on musl
(struct _IO_FILE is an implementation detail that is not exposed).
LLDB_RECORD_METHOD(..., (FILE *), ...) transitively uses sizeof(FILE)
and requires the structure to be complete. Change it to
LLDB_RECORD_DUMMY to fix the build failure on musl (regression of