cnxcc: use pkg-config for hiredis lib compile flags

(cherry picked from commit 162ccda)

modules/cnxcc/Makefile

@@ -1,14 +1,33 @@
 #
 # cnxcc module makefile
 #
-# 
+#
 # WARNING: do not run this directly, it should be run by the master Makefile
 
 include ../../Makefile.defs
 auto_gen=
 NAME=cnxcc.so
 
-LIBS=-lhiredis -levent
+ifeq ($(CROSS_COMPILE),)
+HIREDIS_BUILDER = $(shell \
+	if pkg-config --exists libcre; then \
+		echo 'pkg-config hiredis'; \
+	else \
+		which pcre-config; \
+	fi)
+endif
+
+ifeq ($(HIREDIS_BUILDER),)
+	HIREDISDEFS=-I$(LOCALBASE)/include
+	HIREDISLIBS=-L$(LOCALBASE)/lib -lhiredis
+else
+	HIREDISDEFS = $(shell $(HIREDIS_BUILDER) --cflags)
+	HIREDISLIBS = $(shell $(HIREDIS_BUILDER) --libs)
+endif
+
+DEFS+=$(HIREDISDEFS)
+LIBS=$(HIREDISLIBS) -levent
+
 DEFS+=-DOPENSER_MOD_INTERFACE
 SERLIBPATH=../../lib
 SER_LIBS+=$(SERLIBPATH)/kmi/kmi