package/open2300: use mysql_config to retrieve cflags and libs

oracle-mysql won't built its own bundled zlib since commit
6fed83a03047535d4a9c849352f8c21b30177fcd so don't unconditionally link
with zlib instead use mysql_config to retrieve cflags and libs as
suggested by Thomas Petazzoni in review of first iteration

Fixes:
 - No autobuilder failures yet

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/open2300/open2300.mk

@@ -19,12 +19,8 @@ OPEN2300_LDFLAGS = $(TARGET_LDFLAGS)
 ifeq ($(BR2_PACKAGE_MYSQL),y)
 OPEN2300_DEPENDENCIES += mysql
 OPEN2300_BINS += mysql2300 mysqlhistlog2300
-OPEN2300_CFLAGS += -I$(STAGING_DIR)/usr/include/mysql
-OPEN2300_LDFLAGS += -L$(STAGING_DIR)/usr/lib/mysql -lmysqlclient
-ifeq ($(BR2_STATIC_LIBS),y)
-# mysql needs -lz, so we need to specify it for static builds
-OPEN2300_LDFLAGS += -lz
-endif
+OPEN2300_CFLAGS += $(shell $(STAGING_DIR)/usr/bin/mysql_config --cflags)
+OPEN2300_LDFLAGS += $(shell $(STAGING_DIR)/usr/bin/mysql_config --libs)
 endif
 
 define OPEN2300_BUILD_CMDS