ios build: Turn on "Missing Localizability" for project.

Part of the RN v0.61 -> v0.62 changes to the template app [1],
corresponding to facebook/react-native@ebb629d05. This is a warning
we've seen for a while (zulip#4112), and there's no suggestion that we
can't do it before the main upgrade commit.

This change appears in the Upgrade Support repo's official guide for
how to change the Xcode files using Xcode [2]. While some of that
guide is out-of-date with the actual Xcode files in the template
app, this particular change is correct.

[1] https://react-native-community.github.io/upgrade-helper/?from=0.61.5&to=0.62.2
[2] react-native-community/upgrade-support#13

ios/ZulipMobile.xcodeproj/project.pbxproj

@@ -175,7 +175,7 @@
 		83CBB9F71A601CBA00E9B192 /* Project object */ = {
 			isa = PBXProject;
 			attributes = {
-				LastUpgradeCheck = 940;
+				LastUpgradeCheck = 1160;
 				TargetAttributes = {
 					13B07F861A680F5B00A75B9A = {
 						DevelopmentTeam = 66KHCWMEYB;
@@ -447,6 +447,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_LOCALIZABILITY_NONLOCALIZED = YES;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_ENABLE_MODULES = YES;
@@ -502,6 +503,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_LOCALIZABILITY_NONLOCALIZED = YES;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_ENABLE_MODULES = YES;

ios/ZulipMobile.xcodeproj/xcshareddata/xcschemes/ZulipMobile release-mode.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0940"
+   LastUpgradeVersion = "1160"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"

ios/ZulipMobile.xcodeproj/xcshareddata/xcschemes/ZulipMobile.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0940"
+   LastUpgradeVersion = "1160"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"