[bug #65359] submake might will lose variable values if their names contain special char

[Howard]

Follow-up Comment #5, bug#65359 (group make):

Hi, Dmitry,

Got it. This explains the test result well.

[comment #3 comment #3:]
> Exporting a make variable makes it available for shell in recipes.
> 
> Removal of a semicolon allows make to avoid shell. Instead makes calls
posix_spawn or fork and exec.


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