pgsql: ECPG: Make the preprocessor emit '; ' if the variable type for a

ECPG: Make the preprocessor emit ';' if the variable type for a list of
variables is varchar. This fixes this test case:

int main(void)
{
    exec sql begin declare section;
    varchar a[50], b[50];
    exec sql end declare section;

    return 0;
}

Since varchars are internally turned into custom structs and
the type name is emitted for these variable declarations,
the preprocessed code previously had:

struct varchar_1  { ... }  a _,_  struct varchar_2  { ... }  b ;

The comma in the generated C file was a syntax error.

There are no regression test changes since it's not exercised.

Patch by Boszormenyi Zoltan <zb@cybertec.at>

Conflicts:
    src/interfaces/ecpg/preproc/ecpg.trailer

Branch
------
REL8_4_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/3b41a7c74a7c449b0fc18d8e77b8f6ac9965c54a

Modified Files
--------------
src/interfaces/ecpg/preproc/ecpg.trailer |    7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)