pgsql: Improve gendef.pl diagnostic on failure to open sym file

Improve gendef.pl diagnostic on failure to open sym file

There have been numerous buildfarm failures but the diagnostic is
currently silent about the reason for failure to open the file. Let's
see if we can get to the bottom of it.

Backpatch to all live branches.

Branch
------
REL9_5_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/351d9b7d4e2539de6dd6b948a5ba128f07032b0b

Modified Files
--------------
src/tools/msvc/gendef.pl | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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