Обсуждение: pgsql: When using GCC, change the default CFLAGS to: -O2 -Wall

Log Message:
-----------
When using GCC, change the default CFLAGS to:

  -O2 -Wall -Wmissing-prototypes -Wpointer-arith

Check whether the version of GCC we are using supports any of:

  -Wdeclaration-after-statement
  -Wendif-labels
  -Wold-style-definition

And add the supported flags to CFLAGS.

Modified Files:
--------------
    pgsql:
        configure (r1.402 -> r1.403)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/configure.diff?r1=1.402&r2=1.403)
        configure.in (r1.381 -> r1.382)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/configure.in.diff?r1=1.381&r2=1.382)
    pgsql/config:
        c-compiler.m4 (r1.12 -> r1.13)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/config/c-compiler.m4.diff?r1=1.12&r2=1.13)
    pgsql/src:
        Makefile.global.in (r1.203 -> r1.204)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/Makefile.global.in.diff?r1=1.203&r2=1.204)