TRUE/FALSE may not be defined, so emitting those symbols when generating
code for `... BOOLEAN DEFAULT TRUE -- or FALSE` causes the generated
code to fail to compile. We could move the definitions of TRUE/FALSE to
krb5-types.h, or maybe we could have an asn1_compile option to force
inclusion of more than one header file so we can have headers defining
such constants. But the simplest fix is to just emit 1/0 instead of
TRUE/FALSE.
This explains why some BOOLEAN DEFAULT usages in PKIX are made OPTIONAL
in Heimdal.
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