remove zstd support on tegra platform to allow building of mender-cli 3.5

[PercevalSA]

zstd prevent the build of mender client 3.5.0 and upper on tegra platforms.

[TheYoctoJester]

Hi @PercevalSA, generally I'm fine with merging that as I understand it unblocks your build. However for our future selves, can you please extend the commit message such that it makes clear why exactly this is required (e.g., what in the toolchain, which dependency or which error causes the build breakage) and why this incorporates disabling the PTEST? Then I'm okay with going ahead. Thanks!

[TheYoctoJester]

Hi @PercevalSA, generally I'm fine with merging that as I understand it unblocks your build. However for our future selves, can you please extend the commit message such that it makes clear why exactly this is required (e.g., what in the toolchain, which dependency or which error causes the build breakage) and why this incorporates disabling the PTEST? Then I'm okay with going ahead. Thanks!

@PercevalSA ping

[PercevalSA]

Hello @TheYoctoJester ,

I only applied the changes I received from @MuchoLucho via support https://support.northern.tech/hc/en-us/requests/8848.
I have no idea on why removing PTEST is required.

The problem was when building mender-client from 3.5.0 version I received the following error messages

github.com/gorilla/websocket
# github.com/klauspost/compress/zstd/internal/xxhash
asm: illegal combination: 00072 (<unknown line number>)	PCALIGN	$16 ABCON0 NONE NONE NONE, 4 0
asm: illegal combination: 00072 (<unknown line number>)	PCALIGN	$16 ABCON0 NONE NONE NONE, 4 0
asm: illegal combination: 00072 (<unknown line number>)	PCALIGN	$16 ABCON0 NONE NONE NONE, 4 0
asm: illegal combination: 00072 (<unknown line number>)	PCALIGN	$16 ABCON0 NONE NONE NONE, 4 0
asm: illegal combination: 00032 (<unknown line number>)	PCALIGN	$16 ABCON0 NONE NONE NONE, 4 0
asm: illegal combination: 00032 (<unknown line number>)	PCALIGN	$16 ABCON0 NONE NONE NONE, 4 0
asm: illegal combination: 00032 (<unknown line number>)	PCALIGN	$16 ABCON0 NONE NONE NONE, 4 0
asm: illegal combination: 00032 (<unknown line number>)	PCALIGN	$16 ABCON0 NONE NONE NONE, 4 0
asm: assembly failed
github.com/minio/sha256-simd

[...]

# github.com/bmatsuo/lmdb-go/lmdb
mdb.c: In function 'mdb_cursor_put':
mdb.c:6535:9: warning: this statement may fall through [-Wimplicit-fallthrough=]
      if (SIZELEFT(fp) < offset) {
         ^
mdb.c:6540:5: note: here
     case MDB_CURRENT:
     ^~~~
github.com/mendersoftware/mender/store