Build htslib 1.16

[jdblischak]

This PR builds m2w64-htslib using htslib 1.16

xref: TileDB-Inc/tiledb-vcf-feedstock#106

I removed the patchfile for htslib/vcf.h because it is no longer needed (and the build fails if patch tries to apply an unneeded patchfile):

https://github.com/samtools/htslib/blob/4e61c128238f3e7cbb3b1f4e9c0fdb4880aa9a10/htslib/vcf.h#L1435-L1439

HTSLIB_EXPORT
extern uint32_t bcf_float_vector_end;
HTSLIB_EXPORT
extern uint32_t bcf_float_missing;
static inline void bcf_float_set(float *ptr, uint32_t value)

Ideally we will eventually build htslib 1.19, but I'm currently getting build errors

[jdblischak]

The linking is still the same as the previous build:

Dump of file hts-3.dll
File Type: DLL
    ADVAPI32.dll
    KERNEL32.dll
    msvcrt.dll
    USER32.dll
    WS2_32.dll
    bcrypt.dll
    CRYPT32.dll
    WLDAP32.dll

[ihnorton]

Thanks!