Fix new typos found by codespell

[DimitriPapadopoulos]

No description provided.

[spaette]

prettify
skippable

$ grep -n pretify zstd/lib/decompress/zstd_decompress_block.c
361: * - pretify output, report below, test with fuzzer to ensure it's correct */
$ grep -n skippeable zstd/lib/decompress/zstd_decompress.c
814: *  `src` must point to the start of a ZSTD frame or a skippeable frame
$ 

[spaette]

@Cyan4973

would like to add a few more changes with your approval

$ grep -n "GNUC compatible" zstd/lib/common/portability_macros.h
93: * Only enable assembly for GNUC compatible compilers,
$ grep -nr casted zstd
zstd/lib/compress/zstd_compress.c:2609:    assert(size < (1U<<31));   /* can be casted to int */
$ grep -nr compiation zstd
zstd/build/cmake/CMakeModules/AddZstdCompilationFlags.cmake:60:        # EnableCompilerFlag("-std=c99" true false)   # Set C compiation to c99 standard
$ grep -nr ditionary zstd
zstd/CHANGELOG:492:fix : bug #944 : multithreading with shared ditionary and large data, reported by @gsliepen
$ grep -nr relevants zstd
zstd/lib/compress/zstd_compress.c:5625: *            into its relevants cParams.
$ grep -nr trigging zstd
zstd/lib/common/compiler.h:329: * Helper function to perform a wrapped pointer difference without trigging
$ 

fixes for above

sed -i "s/GNUC compatible/GNU C compatible/g" zstd/lib/common/portability_macros.h
sed -i "s/casted/cast/g" zstd/lib/compress/zstd_compress.c
sed -i "s/compiation/compilation/g" zstd/build/cmake/CMakeModules/AddZstdCompilationFlags.cmake
sed -i "s/ditionary/dictionary/g" zstd/CHANGELOG
sed -i "s/relevants/relevant/g" zstd/lib/compress/zstd_compress.c
sed -i "s/trigging/triggering/g" zstd/lib/common/compiler.h

---

@DimitriPapadopoulos

for the record approximatively appears in the Oxford dictionary

easier to read however with your change of that string

[Cyan4973]

@spaette
These suggestions look good to me

[DimitriPapadopoulos]

Indeed approximatively appears in the OED. It is missing from other mainstream curated dictionaries, and perhaps more importantly (?) is missing from SCOWLS (and friends) which I see as the reference dictionary for open source spell checking.

[DimitriPapadopoulos]

I have added all your suggestions.

[spaette]

the .c, .h, and .cmake files' changes are limited to comments which shouldn't account for the 2 failed checks