Increase iOS deployment target from 10 to 12.

TBR=kthelgason@webrtc.org

Bug: webrtc:12928
Change-Id: I50de09972bf012e78a9bc9f1d98d8d07aab4e180
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/224543
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Peter Hanspers <peterhanspers@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34409}
diff --git a/tools_webrtc/ios/build_ios_libs.py b/tools_webrtc/ios/build_ios_libs.py
index 3be0eb1..a3a40b7 100755
--- a/tools_webrtc/ios/build_ios_libs.py
+++ b/tools_webrtc/ios/build_ios_libs.py
@@ -31,7 +31,7 @@
 SDK_FRAMEWORK_NAME = 'WebRTC.framework'
 
 DEFAULT_ARCHS = ENABLED_ARCHS = ['arm64', 'arm', 'x64', 'x86']
-IOS_DEPLOYMENT_TARGET = '10.0'
+IOS_DEPLOYMENT_TARGET = '12.0'
 LIBVPX_BUILD_VP9 = False
 
 sys.path.append(os.path.join(SCRIPT_DIR, '..', 'libs'))