package/webkitgtk: disable JSC JIT for MIPSr6

Forcibly disable the JavaScriptCore JIT compilation support
for MIPSr6 processors, which are unsupported.

Fixes: http://autobuild.buildroot.net/results/3d21d3c3460cd85a4c828dd197929cdf17aaf4e0

Signed-off-by: Adrian Perez de Castro <aperez@igalia.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 5eb70cecedd03e08977a06bcc115b6a954d3da9a)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/webkitgtk/webkitgtk.mk

@@ -95,4 +95,13 @@ else
 WEBKITGTK_CONF_OPTS += -DUSE_GSTREAMER_GL=OFF
 endif
 
+# JIT is not supported for MIPS r6, but the WebKit build system does not
+# have a check for these processors. Disable JIT forcibly here and use
+# the CLoop interpreter instead.
+#
+# Upstream bug: https://bugs.webkit.org/show_bug.cgi?id=191258
+ifeq ($(BR2_MIPS_CPU_MIPS32R6)$(BR2_MIPS_CPU_MIPS64R6),y)
+WEBKITGTK_CONF_OPTS += -DENABLE_JIT=OFF -DENABLE_C_LOOP=ON
+endif
+
 $(eval $(cmake-package))