Fix libtiff test configuration

[benz0li]

• Close Configuration fails to find libtiff-4 system library #16

[benz0li]

configure.log

src/sysdep_tests/sysdep_libtiff.cpp: In function ‘int main()’:
src/sysdep_tests/sysdep_libtiff.cpp:5:11: warning: unused variable ‘tiff’ [-Wunused-variable]
    5 |     TIFF *tiff = TIFFStreamOpen("memory", &tiff_ostream);
      |           ^~~~

---

ldd tmp_libtiff_test

        linux-vdso.so.1 (0x0000ffff813f3000)
        libtiffxx.so.6 => /lib/aarch64-linux-gnu/libtiffxx.so.6 (0x0000ffff81360000)
        libstdc++.so.6 => /lib/aarch64-linux-gnu/libstdc++.so.6 (0x0000ffff81140000)
        libgcc_s.so.1 => /lib/aarch64-linux-gnu/libgcc_s.so.1 (0x0000ffff81100000)
        libc.so.6 => /lib/aarch64-linux-gnu/libc.so.6 (0x0000ffff80f50000)
        /lib/ld-linux-aarch64.so.1 (0x0000ffff813b6000)
        libtiff.so.6 => /lib/aarch64-linux-gnu/libtiff.so.6 (0x0000ffff80eb0000)
        libm.so.6 => /lib/aarch64-linux-gnu/libm.so.6 (0x0000ffff80e10000)
        libwebp.so.7 => /lib/aarch64-linux-gnu/libwebp.so.7 (0x0000ffff80d90000)
        libzstd.so.1 => /lib/aarch64-linux-gnu/libzstd.so.1 (0x0000ffff80cd0000)
        liblzma.so.5 => /lib/aarch64-linux-gnu/liblzma.so.5 (0x0000ffff80c80000)
        libLerc.so.4 => /lib/aarch64-linux-gnu/libLerc.so.4 (0x0000ffff80bd0000)
        libjbig.so.0 => /lib/aarch64-linux-gnu/libjbig.so.0 (0x0000ffff80ba0000)
        libjpeg.so.62 => /lib/aarch64-linux-gnu/libjpeg.so.62 (0x0000ffff80b20000)
        libdeflate.so.0 => /lib/aarch64-linux-gnu/libdeflate.so.0 (0x0000ffff80ae0000)
        libz.so.1 => /lib/aarch64-linux-gnu/libz.so.1 (0x0000ffff80aa0000)

[nx10]

Thanks!