ios: Might as well generate the CFBundleShortVersionString from that other version.

GNUmakefile

@@ -910,6 +910,12 @@ src/android/AndroidManifest.xml : $(firstword $(MAKEFILE_LIST))
 		-e 's/android:targetSdkVersion="[[:digit:]]*"/android:targetSdkVersion="$(ANDROID_TARGET_SDK_VERSION)"/' \
 		$@
 
+src/ios/Info.plist : $(firstword $(MAKEFILE_LIST))
+	@echo "[ios_version] $@"
+	@sed -z -r -i \
+		-e 's@(<key>CFBundleShortVersionString</key>\s*<string>)[0-9.]*(</string>)@\1$(VERSION_NUMBER)\2@' \
+		$@
+
 ##
 ## Android targets:
 ##