Disable pcx by default #1685

Job	Run time
Fuzz targets (afl)	2m 14s
Fuzz targets (cargo-fuzz)	49s
cargo-deny	16s
build_benchmarks	51s
cargo-semver-checks	33s
clippy	1m 59s
public_private_dependencies	25s
rustfmt	12s
test_avif_decoding	1m 43s
test_features	30s
test_toolchains (1.70.0)	27s
test_other_archs (powerpc-unknown-linux-gnu)	2m 40s
test_features (default)	1m 51s
test_toolchains (nightly)	1m 19s
test_other_archs (i686-unknown-linux-gnu)	1m 38s
test_toolchains (beta)	1m 35s
test_features (rayon)	44s
test_features (avif)	1m 2s
test_features (bmp)	28s
test_features (dds)	31s
test_features (exr)	43s
test_features (ff)	26s
test_features (gif)	34s
test_features (hdr)	27s
test_features (ico)	32s
test_features (jpeg)	34s
test_features (pcx)	32s
test_features (png)	31s
test_features (pnm)	32s
test_features (qoi)	28s
test_features (tga)	21s
test_features (tiff)	35s
test_features (webp)	30s
	28m 32s

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