civetweb: use TARGET_CONFIGURE_OPTS

Instead of explicitly handling CC/LD/CFLAGS. No functional change, but it is
cleaner like this.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/civetweb/civetweb.mk

@@ -10,7 +10,7 @@ CIVETWEB_LICENSE = MIT
 CIVETWEB_LICENSE_FILES = LICENSE.md
 
 CIVETWEB_CONF_OPTS = TARGET_OS=LINUX WITH_IPV6=1
-CIVETWEB_COPT = $(TARGET_CFLAGS) -DHAVE_POSIX_FALLOCATE=0
+CIVETWEB_COPT = -DHAVE_POSIX_FALLOCATE=0
 CIVETWEB_LIBS = -lpthread -lm
 CIVETWEB_SYSCONFDIR = /etc
 CIVETWEB_HTMLDIR = /var/www
@@ -29,13 +29,13 @@ CIVETWEB_COPT += -DNO_SSL
 endif
 
 define CIVETWEB_BUILD_CMDS
-	$(MAKE) CC="$(TARGET_CC)" LDFLAGS="$(TARGET_LDFLAGS)" -C $(@D) build \
+	$(TARGET_CONFIGURE_OPTS) $(MAKE) -C $(@D) build \
 		$(CIVETWEB_CONF_OPTS) \
 		COPT="$(CIVETWEB_COPT)" LIBS="$(CIVETWEB_LIBS)"
 endef
 
 define CIVETWEB_INSTALL_TARGET_CMDS
-	$(MAKE) CC="$(TARGET_CC)" -C $(@D) install \
+	$(TARGET_CONFIGURE_OPTS) $(MAKE) -C $(@D) install \
 		DOCUMENT_ROOT="$(CIVETWEB_HTMLDIR)" \
 		CONFIG_FILE2="$(CIVETWEB_SYSCONFDIR)/civetweb.conf" \
 		HTMLDIR="$(TARGET_DIR)$(CIVETWEB_HTMLDIR)" \