neon: use := assignments

package/neon/neon.mk

@@ -3,13 +3,11 @@
 # neon
 #
 #############################################################
-NEON_VERSION = 0.28.3
-NEON_SITE = http://www.webdav.org/neon/
-NEON_INSTALL_STAGING = YES
-
-NEON_CONF_OPT+=--enable-shared --without-gssapi --disable-rpath
-
-NEON_INSTALL_TARGET_OPT=DESTDIR=$(TARGET_DIR) install
+NEON_VERSION:=0.28.3
+NEON_SITE:=http://www.webdav.org/neon/
+NEON_INSTALL_STAGING:=YES
+NEON_INSTALL_TARGET_OPT:=DESTDIR=$(TARGET_DIR) install
+NEON_CONF_OPT:=--enable-shared --without-gssapi --disable-rpath
 
 NEON_DEPENDENCIES:=pkgconfig