[minizip] fix building with Android API level < 24

[kambala-decapitator]

the 64-bit functions are available only since Android API level 24 and are additionally under __USE_FILE_OFFSET64. From NDK's stdio.h:

/* See https://android.googlesource.com/platform/bionic/+/main/docs/32-bit-abi.md */
#if defined(__USE_FILE_OFFSET64)

#if __ANDROID_API__ >= 24
int fgetpos(FILE* _Nonnull __fp, fpos_t* _Nonnull __pos) __RENAME(fgetpos64) __INTRODUCED_IN(24);
int fsetpos(FILE* _Nonnull __fp, const fpos_t* _Nonnull __pos) __RENAME(fsetpos64) __INTRODUCED_IN(24);
int fseeko(FILE* _Nonnull __fp, off_t __offset, int __whence) __RENAME(fseeko64) __INTRODUCED_IN(24);
off_t ftello(FILE* _Nonnull __fp) __RENAME(ftello64) __INTRODUCED_IN(24);
#endif /* __ANDROID_API__ >= 24 */

supersedes #436

[Neustradamus]

@gvollant, @madler: Have you seen this PR?