coova-chilli: disable parallel build

Parallel building is causing a failure because it executes some
commands, such as patch, more than once.

Signed-off-by: Eneas U de Queiroz <cotequeiroz@gmail.com>

net/coova-chilli/Makefile

@@ -21,7 +21,7 @@ PKG_LICENSE_FILES:=COPYING
 
 PKG_FIXUP:=autoreconf
 PKG_INSTALL:=1
-PKG_BUILD_PARALLEL:=1
+PKG_BUILD_PARALLEL:=0
 
 PKG_CONFIG_DEPENDS:= \
   COOVACHILLI_MINIPORTAL \