Fix type names starting with lowercase 'a' (#69)

Type names that start with a lowercase 'a' cause an error when used:

$ typeset -T al=(typeset bar)
$ al foo=(bar=testset)
/usr/bin/ksh: al: : invalid variable name

The error occurs because when the parser checks for the alias
builtin (to set 'assignment' to two instead of one), only the first
letter of 'argp->argval' is checked (rather than the entire
string). This was fixed in ksh93v- by comparing argp->argval
against "alias", but in ksh93u+m the check can simply be removed
because it is only run when a builtin has the BLT_DCL flag. As of
04b9171, the alias builtin does not have that flag.

src/cmd/ksh93/sh/parse.c:
- Remove the bugged check for the alias builtin.

src/cmd/ksh93/tests/types.sh:
- Add a regression test for type names starting with a lowercase 'a'.

NEWS

@@ -3,6 +3,11 @@ For full details, see the git log at: https://github.com/ksh93/ksh
 
 Any uppercase BUG_* names are modernish shell bug IDs.
 
+2020-07-10:
+
+- Fixed a bug that caused types created with 'typeset -T' to throw an error
+  when used if the type name started with a lowercase 'a'.
+
 2020-07-09:
 
 - Fixed a crash on syntax error when sourcing/dotting multiple files.