Change the macOS-specific suffix from 'os-x' to 'mac'.

This change results in the macOS package beinf suffixed with '-mac'
rather than '-os-x', as suggested by Jim Balhoff since "OS X" is no
longer the name used by Apple to refer to its desktop operating system.

pom.xml

@@ -23,7 +23,7 @@
         <protege.directory>Protege-${protege.version}</protege.directory>
 
         <!-- The directory where the OS X distribution should be assembled -->
-        <os-x.directory>${protege.directory}-os-x</os-x.directory>
+        <os-x.directory>${protege.directory}-mac</os-x.directory>
 
         <!-- The directory where the Linux distribution should be assembled -->
         <linux.directory>${protege.directory}-linux</linux.directory>
@@ -223,7 +223,7 @@
                                     <groupId>edu.stanford.protege</groupId>
                                     <artifactId>protege-desktop</artifactId>
                                     <version>${protege.version}</version>
-                                    <classifier>os-x</classifier>
+                                    <classifier>mac</classifier>
                                     <type>zip</type>
                                     <outputDirectory>${project.build.directory}/${os-x.directory}</outputDirectory>
                                     <overWrite>true</overWrite>

src/main/resources/os-x-assembly.xml

@@ -1,7 +1,7 @@
 <assembly xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2 http://maven.apache.org/xsd/assembly-1.1.2.xsd">
-    <id>os-x</id>
+    <id>mac</id>
     <formats>
         <format>zip</format>
     </formats>