Set PJ_AUTOCONF on react-native-pjsip.podspec

[asukiaaa]

I got the following errors at building.

Compile PjSipVideoViewManager.m
[project_dir]/ios/VialerPJSIP.framework/Headers/pj/config.h:303:5: "Please specify target machine."
[project_dir]/ios/VialerPJSIP.framework/Headers/pj/config.h:1297:4: "PJ_HAS_PENTIUM is not defined!"
[project_dir]/ios/VialerPJSIP.framework/Headers/pj/config.h:1301:4: "PJ_IS_LITTLE_ENDIAN is not defined!"
[project_dir]/ios/VialerPJSIP.framework/Headers/pj/config.h:1305:4: "PJ_IS_BIG_ENDIAN is not defined!"

To avoid them, I set PJ_AUTOCONF on react-native-pjsip.podspec.
Thanks.

Environments:

• MacOS 10.15.7
• Xcode 12.0.1
• iOS 13.5.1 (iPhone X)
• react-native 0.63.2

References:

• iOS build fails after update to 2.9.0 florindumitru/react-native-sip#6 (comment)
• https://github.com/FastPBX/react-native-sip/blob/14cbbf082bc484c8ed8651b110adf475acb2f7bf/react-native-sip.podspec#L19-L22

[linus-komnick]

@asukiaaa This works great! Thx so much!
@datso Could you please merge this branch? Without this commit building the app in Xcode fails and you have to set PJ_AUTOCONF=1 every time you want to build the app which is annoying... Thx in advance!