* fix link failure with libtiff
The fuzz targets were failing to link with:
```
Step #4: /work/lib/libtiff.a(tif_lzma.o): In function `TIFFInitLZMA':
Step #4: /src/libtiff/libtiff/tif_lzma.c:465: undefined reference to
`lzma_lzma_preset'
```
It looks like it's become necessary to explicitly link -llzma, see:
4159bda6db
oss-fuzz issue:
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=18928#c4
Thanks to @lovell.
* pin libtiff to 4.1.0
It seems there's an issue with git master libtiff -- it fails to link on
systems without lzma installed.
For now, pin to 4.1.0, the current stable version.
* explicitly disable lzma
lzma detection in libtiff seems to be broken as of 20 nov. Disable
explicitly.
Lovell Fuller