Add apple silicon info to templates

(cherry picked from commit 7d483da86adac79fdec8ba1533924df982da9f86)

.gitignore

@@ -80,6 +80,7 @@ doc/internals/ltxpng
 *.mexa64
 *.mexw32
 *.mexw64
+*.mexmaca64
 *.mexmaci
 *.mexmaci64
 /mex/matlab/

macOS/distribution_template.xml

@@ -6,7 +6,7 @@
   <welcome file="welcome.html" mime-type="text/html" />
   <license file="gpl-3.0-standalone.html" mime-type="text/html" />
   <pkg-ref id="org.dynare" />
-  <options customize="allow" require-scripts="false" hostArchitectures="x86_64" />
+  <options customize="allow" require-scripts="false" hostArchitectures="x86_64,arm64" />
   <choices-outline>
     <line choice="org.dynare" />
     <line choice="org.dynare.gcc" />

macOS/welcome_template.html

@@ -10,6 +10,6 @@
 
     <p>Installing GCC will require an active internet connection with the ability to connect to the Apple servers and GitHub. The installation will take anywhere from a few minutes to a half an hour during the <i>Running package scripts</i> phase of Installation. The time it takes depends on your internet speed, the speed of your computer, and whether or not you already have XCode Command Line Tools installed. The progress bar will not advance during this phase. Please be patient.</p>
 
-    <p> You can choose not to install GCC by choosing <i>Customize</i> from the <i>Installation Type</i> screen and deselecting <i>GCC compiler</i>. If you already have <tt>GCC_BINARY</tt> installed under <tt>/usr/local</tt>, you can forgo the installation of GCC here as Dynare will find your system compiler when you use <tt>use_dll</tt>.</p>
+    <p> You can choose not to install GCC by choosing <i>Customize</i> from the <i>Installation Type</i> screen and deselecting <i>GCC compiler</i>. If you already have <tt>GCC_BINARY</tt> installed under either <tt>/opt/homebrew/bin</tt> for Apple Silicon or <tt>/usr/local/bin</tt> for Intel systems, you can forgo the installation of GCC here as Dynare will find your system compiler when you use <tt>use_dll</tt>.</p>
   </body>
 </html>