Revert "Fetch the custom cfg/CONFIG_* files early"

This reverts commit e4fbd83c93.

It introduced a build problem when using INSTALL_LOCATION:
The system yacc and lex are used instead of the EPICS antelope and e_flex.

configure/CONFIG

@@ -50,9 +50,6 @@ endif
 include $(CONFIG)/CONFIG_COMMON
 include $(CONFIG)/CONFIG_FILE_TYPE
 
-# Fetch the module-specific CFGS before overwriting INSTALL_LOCATION in order to load them later
-TOP_CFG_CONFIGS := $(wildcard $(INSTALL_CFG)/CONFIG*)
-
 #  Base-specific build options
 #
 include $(CONFIG)/CONFIG_BASE
@@ -120,6 +117,7 @@ endif
 
 # Include $(INSTALL_CFG)/CONFIG* definitions
 #
+TOP_CFG_CONFIGS = $(wildcard $(INSTALL_CFG)/CONFIG*)
 ifneq ($(TOP_CFG_CONFIGS),)
   include $(TOP_CFG_CONFIGS)
 endif