Update podspec to support macOS

Merged from https://github.com/aapierce0/OLMKit/commits/macOS_port

Sign-off taken from https://github.com/matrix-org/matrix-ios-sdk/pull/218#issue-201062079.

OLMKit.podspec

@@ -17,45 +17,46 @@ Pod::Spec.new do |s|
 
   s.license      = { :type => "Apache License, Version 2.0", :file => "LICENSE" }
 
-  s.authors            = { "Chris Ballinger" => "chrisballinger@gmail.com", 
+  s.authors            = { "Chris Ballinger" => "chrisballinger@gmail.com",
                            "matrix.org" => "support@matrix.org" }
 
-  s.platform     = :ios, "5.0"
+  s.ios.deployment_target = "5.0"
+  s.osx.deployment_target = "10.9"
 
   # Expose the Objective-C wrapper API of libolm
   s.public_header_files = "xcode/OLMKit/*.h"
 
-  s.source       = { 
-    :git => "https://matrix.org/git/olm.git", 
-    :tag => s.version.to_s 
+  s.source       = {
+    :git => "https://matrix.org/git/olm.git",
+    :tag => s.version.to_s
   }
-    
+
   s.source_files = "xcode/OLMKit/*.{h,m}", "include/**/*.{h,hh}", "src/*.{c,cpp}", "lib/crypto-algorithms/sha256.c",  "lib/crypto-algorithms/aes.c", "lib/curve25519-donna/curve25519-donna.c"
-  
+
   # Those files (including .c) are included by ed25519.c. We do not want to compile them twice
   s.preserve_paths = "lib/ed25519/**/*.{h,c}"
-  
+
   s.library = "c++"
-  
-  
+
+
   # Use the same compiler options for C and C++ as olm/Makefile
-  
+
   s.compiler_flags = "-g -O3 -DOLMLIB_VERSION_MAJOR=#{MAJOR} -DOLMLIB_VERSION_MINOR=#{MINOR} -DOLMLIB_VERSION_PATCH=#{PATCH}"
 
   # For headers search paths, manage first the normal installation. Then, use paths used
   # when the pod is local
-  s.xcconfig = { 
+  s.xcconfig = {
     'USER_HEADER_SEARCH_PATHS' =>"${PODS_ROOT}/OLMKit/include ${PODS_ROOT}/OLMKit/lib #{File.join(File.dirname(__FILE__), 'include')} #{File.join(File.dirname(__FILE__), 'lib')}"
   }
-  
+
   s.subspec 'olmc' do |olmc|
     olmc.source_files   = "src/*.{c}", "lib/curve25519-donna.h", "lib/crypto-algorithms/sha256.{h,c}", "lib/crypto-algorithms/aes.{h,c}",  "lib/curve25519-donna/curve25519-donna.c"
     olmc.compiler_flags = ' -std=c99 -fPIC'
   end
-  
+
   s.subspec 'olmcpp' do |olmcpp|
     olmcpp.source_files   = "src/*.{cpp}"
     olmcpp.compiler_flags = ' -std=c++11 -fPIC'
   end
-  
+
 end

xcode/OLMKit/OLMKit.h

@@ -16,7 +16,8 @@
  limitations under the License.
  */
 
-#import <UIKit/UIKit.h>
+#import <Foundation/Foundation.h>
+
 
 //! Project version string for OLMKit, the same as libolm.
 NSString *OLMKitVersionString();