Proposed fix #319 - non-portable uname -i use

*UNTESTED*

Author: krayon

functions.sh

@@ -31,26 +31,16 @@ OPTIONS="-o Debug::NoLocking=1
 
 # Detect system architecture to know which binaries of AppImage tools
 # should be downloaded and used.
-case "$(uname -i)" in
+case "$(uname -m)" in
   x86_64|amd64)
 #    echo "x86-64 system architecture"
     SYSTEM_ARCH="x86_64";;
   i?86)
 #    echo "x86 system architecture"
     SYSTEM_ARCH="i686";;
-#  arm*)
+#  arm*|aarch*)
 #    echo "ARM system architecture"
 #    SYSTEM_ARCH="";;
-  unknown|AuthenticAMD|GenuineIntel)
-#         uname -i not answer on debian, then:
-    case "$(uname -m)" in
-      x86_64|amd64)
-#        echo "x86-64 system architecture"
-        SYSTEM_ARCH="x86_64";;
-      i?86)
-#        echo "x86 system architecture"
-        SYSTEM_ARCH="i686";;
-    esac ;;
   *)
     echo "Unsupported system architecture"
     exit 1;;