ash: retain envvars with bad names in initial environment. Closes 10231
Reworks "ash: [VAR] Sanitise environment variable names on entry"
commit.
Signed-off-by: 
Denys Vlasenko <vda.linux@googlemail.com>
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Reworks "ash: [VAR] Sanitise environment variable names on entry"
commit.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>