Merge pull request #2609 from mstoeckl/tga-xrgb1555 #2454

Job	Run time
clippy	37s
test_toolchains (nightly)	1m 38s
test_toolchains (beta)	1m 54s
test_toolchains (1.85.0)	32s
cargo-deny	19s
rustfmt	9s
test_avif_decoding	1m 45s
test_features (default)	2m 9s
test_features (avif)	1m 18s
test_features (rayon)	55s
test_features (dds)	54s
test_features (bmp)	50s
test_features	52s
test_features (hdr)	56s
test_features (ff)	53s
test_features (png)	58s
test_features (qoi)	1m 5s
test_features (ico)	56s
test_features (pnm)	56s
test_features (tiff)	58s
test_features (gif)	1m 13s
test_features (webp)	53s
test_features (tga)	49s
test_features (exr)	59s
test_features (jpeg)	48s
test_other_archs (i686-unknown-linux-gnu)	2m 55s
test_other_archs (powerpc64-unknown-linux-gnu)	7m 5s
public_private_dependencies	28s
Fuzz targets (cargo-fuzz)	50s
Fuzz targets (afl)	2m 20s
cargo-semver-checks	45s
build_benchmarks	55s
	40m 34s

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