Cleaned up ecpglib and renamed functions that do not need to be exported.

src/interfaces/ecpg/ChangeLog

src/interfaces/ecpg/compatlib/informix.c

src/interfaces/ecpg/ecpglib/Makefile

src/interfaces/ecpg/ecpglib/connect.c

src/interfaces/ecpg/ecpglib/data.c

src/interfaces/ecpg/ecpglib/descriptor.c

src/interfaces/ecpg/ecpglib/error.c

src/interfaces/ecpg/ecpglib/execute.c

src/interfaces/ecpg/ecpglib/exports.txt

src/interfaces/ecpg/ecpglib/extern.h

src/interfaces/ecpg/ecpglib/memory.c

src/interfaces/ecpg/ecpglib/misc.c

src/interfaces/ecpg/ecpglib/prepare.c

src/interfaces/ecpg/ecpglib/typename.c

src/interfaces/ecpg/include/ecpglib.h

src/interfaces/ecpg/preproc/preproc.y

src/interfaces/ecpg/preproc/type.c

src/interfaces/ecpg/preproc/type.h

...nterfaces/ecpg/test/expected/compat_informix-rnull.stderr

...s/ecpg/test/expected/compat_informix-test_informix.stderr