package/valijson: drop unrecognized option

Commit d264b6e81e1a03c36df55c66771ed26dd767a522 forgot to drop
valijson_INSTALL_HEADERS option which has been removed with
https://github.com/tristanpenman/valijson/commit/c7d5f2cbec08b0e649fdeee6a99f2f1343baaa75

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit a1dce92c728a8df097dee7400305e116485a120a)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/valijson/valijson.mk

@@ -11,6 +11,6 @@ VALIJSON_LICENSE_FILES = LICENSE
 VALIJSON_CPE_ID_VENDOR = valijson_project
 VALIJSON_INSTALL_STAGING = YES
 VALIJSON_INSTALL_TARGET = NO
-VALIJSON_CONF_OPTS = -Dvalijson_INSTALL_HEADERS=TRUE -Dvalijson_BUILD_TESTS=FALSE
+VALIJSON_CONF_OPTS = -Dvalijson_BUILD_TESTS=FALSE
 
 $(eval $(cmake-package))