pgsql: Don't use #include <crtdefs.h> for MSVC <= 1400.

Log Message:
-----------
Don't use #include <crtdefs.h> for MSVC <= 1400.

Hiroshi Saito

Modified Files:
--------------
pgsql/src/include:
c.h (r1.207 -> r1.208)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/c.h.diff?r1=1.207&amp;r2=1.208)