Nothing ever depended on libecpg_compat.so.3 in Fedora, so don't build

it now, at least till somebody explicitly requests that.

diff --git a/src/interfaces/ecpg/Makefile b/src/interfaces/ecpg/Makefile

index 41460a1..cc3dd37 100644

--- a/src/interfaces/ecpg/Makefile

+++ b/src/interfaces/ecpg/Makefile

@@ -2,7 +2,7 @@ subdir = src/interfaces/ecpg

 top_builddir = ../../..

 include $(top_builddir)/src/Makefile.global

-SUBDIRS = include pgtypeslib ecpglib compatlib preproc

+SUBDIRS = include pgtypeslib ecpglib preproc

 # Suppress parallel build of subdirectories to avoid a bug in GNU make 3.82, cf

 # http://savannah.gnu.org/bugs/?30653