pgsql: Un-break ecpg tests for Windows.

Un-break ecpg tests for Windows.

Declaring a function "inline" still doesn't work with Windows compilers
(C99? what's that?), unless the macro provided by pg_config.h is
in-scope, which it is not in our ECPG test programs. So the workaround
I tried to use in commit 7640f9312 doesn't work for Windows. Revert
the change in printf_hack.h, and instead just blacklist that file
in cpluspluscheck --- since it's a not-installed test file, we don't
really need to verify its C++ cleanliness anyway.

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/10a53cae9993abae159abdc6a76e46f6aac120d1

Modified Files
--------------
src/interfaces/ecpg/test/expected/compat_informix-dec_test.c | 2 +-
src/interfaces/ecpg/test/expected/pgtypeslib-num_test.c | 2 +-
src/interfaces/ecpg/test/expected/pgtypeslib-num_test2.c | 2 +-
src/interfaces/ecpg/test/printf_hack.h | 2 +-
src/tools/pginclude/cpluspluscheck | 2 ++
5 files changed, 6 insertions(+), 4 deletions(-)