Fix Info.plist path in build_ios_libs.sh

NOTRY=True
BUG=

Review-Url: https://codereview.webrtc.org/1988003002
Cr-Commit-Position: refs/heads/master@{#12784}

webrtc/sdk/objc/Framework/Headers/WebRTC/WebRTC.h

@@ -30,6 +30,7 @@
 #import <WebRTC/RTCRtpCodecParameters.h>
 #import <WebRTC/RTCRtpEncodingParameters.h>
 #import <WebRTC/RTCRtpParameters.h>
+#import <WebRTC/RTCRtpReceiver.h>
 #import <WebRTC/RTCRtpSender.h>
 #import <WebRTC/RTCSSLAdapter.h>
 #import <WebRTC/RTCSessionDescription.h>