rpm: use external (BR versions) of file and pcre

Saves space in rootfs, and fixes build issues (internal pcre needs
C++ support for unit test, internal file breaks with incompatible
file versions on host).

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/rpm/rpm.mk

@@ -10,14 +10,28 @@ RPM_AUTORECONF = NO
 RPM_DEPENDENCIES = zlib beecrypt neon popt
 
 RPM_CONF_ENV = CFLAGS="$(TARGET_CFLAGS) -I$(STAGING_DIR)/usr/include/beecrypt -I$(STAGING_DIR)/usr/include/neon -DHAVE_MUTEX_THREAD_ONLY" \
-		ac_cv_va_copy=yes 
+		ac_cv_va_copy=yes
 
 RPM_CONF_OPT = --disable-build-versionscript --disable-rpath \
 	--without-selinux \
 	--without-python --without-perl \
 	--with-zlib=$(STAGING_DIR) \
 	--with-libbeecrypt=$(STAGING_DIR) \
-	--with-popt=$(STAGING_DIR) 
+	--with-popt=$(STAGING_DIR)
+
+ifeq ($(BR2_PACKAGE_PCRE),y)
+RPM_DEPENDENCIES += pcre
+RPM_CONF_OPT += --with-pcre=external
+else
+RPM_CONF_OPT += --with-pcre=no
+endif
+
+ifeq ($(BR2_PACKAGE_FILE),y)
+RPM_DEPENDENCIES += file
+RPM_CONF_OPT += --with-file=external
+else
+RPM_CONF_OPT += --with-file=no
+endif
 
 ifeq ($(BR2_PACKAGE_RPM_XZ_PAYLOADS),y)
 RPM_CONF_OPT+=--with-xz