pgsql: Build every ECPG library with -DFRONTEND.

Build every ECPG library with -DFRONTEND.

Each of the libraries incorporates src/port files, which often check
FRONTEND.  Build systems disagreed on whether to build libpgtypes this
way.  Only libecpg incorporates files that rely on it today.  Back-patch
to 9.0 (all supported versions) to forestall surprises.

Branch
------
REL9_2_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/5eab0f1383f0864fe038c2ab13282c9c356f291d

Modified Files
--------------
src/interfaces/ecpg/compatlib/Makefile  |    2 +-
src/interfaces/ecpg/pgtypeslib/Makefile |    2 +-
src/tools/msvc/Mkvcbuild.pm             |    1 +
3 files changed, 3 insertions(+), 2 deletions(-)