Bump libwebp for Apple platform min deployment target version, to fix the Xcode 12 error

Package.swift

@@ -5,6 +5,9 @@ import PackageDescription
 
 let package = Package(
     name: "libwebp",
+    platforms: [
+        .macOS(.v10_10), .iOS(.v8), .tvOS(.v9), .watchOS(.v2)
+    ],
     products: [
         // Products define the executables and libraries produced by a package, and make them visible to other packages.
         .library(

README.md

@@ -11,7 +11,7 @@ This also contains the Swift Package Manager support
 ## Requirements
 
 + iOS 8
-+ macOS 10.6
++ macOS 10.10
 + tvOS 9.0
 + watchOS 2.0
 

libwebp.podspec

@@ -10,8 +10,8 @@ Pod::Spec.new do |s|
   s.compiler_flags = '-D_THREAD_SAFE'
   s.requires_arc = false
 
-  s.osx.deployment_target = '10.8'
-  s.ios.deployment_target = '6.0'
+  s.osx.deployment_target = '10.10'
+  s.ios.deployment_target = '8.0'
   s.tvos.deployment_target = '9.0'
   s.watchos.deployment_target = '2.0'
 

libwebp.xcodeproj/project.pbxproj

@@ -983,7 +983,7 @@
 				GCC_WARN_UNUSED_VARIABLE = YES;
 				HEADER_SEARCH_PATHS = libwebp;
 				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
-				MACOSX_DEPLOYMENT_TARGET = 10.6;
+				MACOSX_DEPLOYMENT_TARGET = 10.10;
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = macosx;
@@ -1057,7 +1057,7 @@
 				GCC_WARN_UNUSED_VARIABLE = YES;
 				HEADER_SEARCH_PATHS = libwebp;
 				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
-				MACOSX_DEPLOYMENT_TARGET = 10.6;
+				MACOSX_DEPLOYMENT_TARGET = 10.10;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = macosx;
 				SUPPORTED_PLATFORMS = "macosx iphonesimulator iphoneos appletvos appletvsimulator watchos watchsimulator";