package/zynaddsubfx: fix PluginEnable option

Replace False by OFF when setting PluginEnable option

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/zynaddsubfx/zynaddsubfx.mk

@@ -11,7 +11,7 @@ ZYNADDSUBFX_LICENSE = GPL-2.0+
 ZYNADDSUBFX_LICENSE_FILES = COPYING
 
 # There is no package in buildroot using LV2 plugins: disabling
-ZYNADDSUBFX_CONF_OPTS = -DPluginEnable=False
+ZYNADDSUBFX_CONF_OPTS = -DPluginEnable=OFF
 
 ifeq ($(BR2_TOOLCHAIN_HAS_LIBATOMIC),y)
 ZYNADDSUBFX_CONF_OPTS += -DCMAKE_EXE_LINKER_FLAGS=-latomic