package/sslh: add optional pcre dependency

pcre dependency has been added in version 1.18 and
https://github.com/yrutschle/sslh/commit/ab3324be477b2663196e0cc73d96aa38d59da65a

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

package/sslh/sslh.mk

@@ -11,12 +11,22 @@ SSLH_LICENSE_FILES = COPYING
 
 SSLH_DEPENDENCIES = libconfig
 
+SSLH_MAKE_OPTS = $(TARGET_CONFIGURE_OPTS)
+
+ifeq ($(BR2_PACKAGE_PCRE),y)
+SSLH_DEPENDENCIES += pcre
+SSLH_MAKE_OPTS += USELIBPCRE=1
+else
+SSLH_MAKE_OPTS += USELIBPCRE=
+endif
+
 define SSLH_BUILD_CMDS
-	$(TARGET_MAKE_ENV) $(MAKE1) $(TARGET_CONFIGURE_OPTS) -C $(@D)
+	$(TARGET_MAKE_ENV) $(MAKE1) $(SSLH_MAKE_OPTS) -C $(@D)
 endef
 
 define SSLH_INSTALL_TARGET_CMDS
-	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D) DESTDIR=$(TARGET_DIR) install
+	$(TARGET_MAKE_ENV) $(MAKE) $(SSLH_MAKE_OPTS) -C $(@D) \
+		DESTDIR=$(TARGET_DIR) install
 endef
 
 define SSLH_INSTALL_INIT_SYSV