bzlib: Fix -Wunused-parameter warnings
This commit fixes the following warnings:
/path/to/bzip2/bzlib.c: In function ‘default_bzalloc’:
/path/to/bzip2/bzlib.c:104:31: warning: unused parameter ‘opaque’ [-Wunused-parameter]
104 | void* default_bzalloc ( void* opaque, Int32 items, Int32 size )
| ~~~~~~^~~~~~
/path/to/bzip2/bzlib.c: In function ‘default_bzfree’:
/path/to/bzip2/bzlib.c:111:29: warning: unused parameter ‘opaque’ [-Wunused-parameter]
111 | void default_bzfree ( void* opaque, void* addr )
| ~~~~~~^~~~~~
/path/to/bzip2/bzlib.c: In function ‘BZ2_bzflush’:
/path/to/bzip2/bzlib.c:1514:34: warning: unused parameter ‘b’ [-Wunused-parameter]
1514 | int BZ_API(BZ2_bzflush) (BZFILE *b)
| ~~~~~~~~^