[gl] proper eglGetSyncAttrib support (guest side)

Fixes: 143285705
Change-Id: I940a5bf8e9fef86978ecdc79f5e12f2ce038d67c

system/renderControl_enc/renderControl_client_context.cpp

diff --git a/system/renderControl_enc/renderControl_client_context.cpp b/system/renderControl_enc/renderControl_client_context.cpp
index 476d0da..54c3f93 100644
--- a/system/renderControl_enc/renderControl_client_context.cpp
+++ b/system/renderControl_enc/renderControl_client_context.cpp
@@ -57,6 +57,7 @@
 	rcSetDisplayPose = (rcSetDisplayPose_client_proc_t) getProc("rcSetDisplayPose", userData);
 	rcSetColorBufferVulkanMode = (rcSetColorBufferVulkanMode_client_proc_t) getProc("rcSetColorBufferVulkanMode", userData);
 	rcReadColorBufferYUV = (rcReadColorBufferYUV_client_proc_t) getProc("rcReadColorBufferYUV", userData);
+	rcIsSyncSignaled = (rcIsSyncSignaled_client_proc_t) getProc("rcIsSyncSignaled", userData);
 	return 0;
 }