pgsql: Remove symbol WIN32_ONLY_COMPILER

Remove symbol WIN32_ONLY_COMPILER

This used to mean "Visual C++ except in those parts where Borland C++
was supported where it meant one of those". Now that we don't support
Borland C++ anymore, simplify by using _MSC_VER which is the normal way
to detect Visual C++.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/a4777f35565b80ae10605d6d417e5d173156f7da

Modified Files
--------------
src/backend/libpq/auth.c | 2 +-
src/backend/libpq/pqcomm.c | 2 +-
src/backend/port/win32/mingwcompat.c | 2 +-
src/common/exec.c | 2 +-
src/include/getaddrinfo.h | 2 +-
src/include/libpq/libpq-be.h | 4 ++--
src/include/port.h | 2 +-
src/include/port/atomics.h | 2 +-
src/include/port/atomics/arch-x86.h | 4 ++--
src/include/port/win32.h | 14 +++++---------
src/include/storage/s_lock.h | 2 +-
src/interfaces/ecpg/test/expected/thread-thread.c | 2 +-
src/interfaces/ecpg/test/expected/thread-thread_implicit.c | 2 +-
src/interfaces/ecpg/test/thread/thread.pgc | 2 +-
src/interfaces/ecpg/test/thread/thread_implicit.pgc | 2 +-
src/interfaces/libpq/fe-auth.c | 2 +-
src/interfaces/libpq/fe-connect.c | 2 +-
src/interfaces/libpq/libpq-int.h | 2 +-
src/tools/msvc/ecpg_regression.proj | 2 +-
19 files changed, 25 insertions(+), 29 deletions(-)