Fix lcov duplicate directory specification in non-VPATH builds.

In an in-tree build, "make coverage-html" invoked lcov with two
"-d ." options, because $(srcdir) is just ".".  With lcov 2.0
(and perhaps earlier versions?) that results in scanning every
foo.gcda file twice and producing counts twice what they should
be.  With later lcov versions (at least 2.3), it results in
"duplicate file" errors.

In VPATH builds we do need two -d options to cover both regular
and generated .c files.  But in in-tree builds it suffices to
specify "-d .", so suppress the second switch.

Author: Narek Galstyan <[email protected]>
Reviewed-by: Tom Lane <[email protected]>
Discussion: 
https://postgr.es/m/cahsn6_xcdqwe8_vvfhtfk27_xtdyvv+dr0ywzaoobz6+-vh...@mail.gmail.com
Backpatch-through: 14

Branch
------
REL_19_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/e1cda300ff7f9c534d215e745b8594b3cdf49d40

Modified Files
--------------
src/Makefile.global.in | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

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