unixodbc: Fix LIB_PREFIX in host build

When copying config.h from PKG_BUILD_DIR to HOST_BUILD_DIR, LIB_PREFIX
is set to /usr/lib.  Then when odbc_config is run, it reports /usr/lib
as the --lib-dir, and in --libs as well, and dependent packages may
fail.  Set it to $(STAGING_DIR)/usr/lib to make it right.

Signed-off-by: Eneas U de Queiroz <cote2004-github@yahoo.com>

libs/unixodbc/Makefile

@@ -132,6 +132,7 @@ endef
 define Host/Configure
 	$(call Host/Configure/Default)
 	cp $(PKG_BUILD_DIR)/config.h $(HOST_BUILD_DIR)
+	sed -i -e 's!\(LIB_PREFIX \).*$$$$!\1"$(STAGING_DIR)/usr/lib"!' $(HOST_BUILD_DIR)/config.h
 	cp $(PKG_BUILD_DIR)/unixodbc_conf.h $(HOST_BUILD_DIR)
 endef