embed.pl: enum and union are like struct in parameters

These keywords all need another word to indicate the parameter type.
Previously only 'struct' was considered to have.

This changed showed an error in one entry embed.fnc, which is also
corrected in this commit.

Author: khwilliamson

embed.fnc

@@ -2693,7 +2693,7 @@ CTp	|Signal_t|perly_sighandler					\
 				|bool safe
 
 Admp	|const char * const|phase_name					\
-				|enum perl_phase
+				|enum perl_phase phase
 Adp	|void	|pmop_dump	|NULLOK PMOP *pm
 : Used in perly.y
 p	|OP *	|pmruntime	|NN OP *o				\

proto.h

@@ -374,7 +374,8 @@ sub generate_proto_h {
 
                     my $temp_arg = $arg;
                     $temp_arg =~ s/\*//g;
-                    $temp_arg =~ s/\s*\bstruct\b\s*/ /g;
+                    $temp_arg =~
+                              s/ \s* \b ( struct | enum | union ) \b \s*/ /xg;
                     if ( ($temp_arg ne "...")
                         && ($temp_arg !~ /\w+\s+(\w+)(?:\[\d+\])?\s*$/) ) {
                         die_at_end "$func: $arg ($n) doesn't have a name\n";