package/openzwave: set back -fPIC

Set back -fPIC in CFLAGS which was wrongly removed as a side effect of
commit c5ca521e23.

Another side-effect of that commit was to remove
-DSYSCONFDIR="\"$(PREFIX)/etc/openzwave/\"" - however, we don't need
SYSCONFDIR to be set, since /etc/openzwave is checked first anyway (see
cpp/src/Options.cpp).

Fixes:
 - http://autobuild.buildroot.org/results/161f53574697016ab8bdb91aaaf4a2be5410ebb0

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/openzwave/openzwave.mk

@@ -23,7 +23,7 @@ OPENZWAVE_INSTALL_STAGING = YES
 # the correct directory otherwise openzwave will install configuration files in
 # $(PREFIX)/etc/openzwave.
 # Disable doxygen documentation.
-# Set {DEBUG,RELEASE}_CFLAGS to an empty value to remove -Werror.
+# Set {DEBUG,RELEASE}_CFLAGS to remove -Werror.
 OPENZWAVE_MAKE_OPTS = \
 	CROSS_COMPILE="$(TARGET_CROSS)" \
 	PREFIX=/usr \
@@ -31,8 +31,8 @@ OPENZWAVE_MAKE_OPTS = \
 	pkgconfigdir=/usr/lib/pkgconfig \
 	sysconfdir=/etc/openzwave \
 	DOXYGEN= \
-	DEBUG_CFLAGS= \
-	RELEASE_CFLAGS= \
+	DEBUG_CFLAGS="-fPIC" \
+	RELEASE_CFLAGS="-fPIC" \
 	USE_BI_TXML=0
 
 ifeq ($(BR2_PACKAGE_HAS_UDEV),y)