configure: sort cases in arch section

Originally committed as revision 17478 to svn://svn.ffmpeg.org/ffmpeg/trunk

configure

@@ -1366,37 +1366,23 @@ fi
 check_cflags -std=c99
 
 case "$arch" in
-    i386|i486|i586|i686|i86pc|BePC)
-        arch="x86"
-        subarch="x86_32"
-        enable fast_unaligned
-    ;;
-    x86_64|amd64)
-        arch="x86"
-        subarch="x86_32"
-        enable cmov
-        enable fast_cmov
-        enable fast_unaligned
-        check_cc <<EOF && enable fast_64bit && subarch="x86_64"
-        int test[sizeof(char*) - 7];
-EOF
-    ;;
-    arm|armv[4567]*l)
-        arch="arm"
-    ;;
     alpha)
         arch="alpha"
         enable fast_64bit
         check_cflags -mieee
     ;;
-    "Power Macintosh"|ppc|powerpc)
-        arch="ppc"
-        enable fast_unaligned
+    arm|armv[4567]*l)
+        arch="arm"
     ;;
-    ppc64)
-        arch="ppc"
+    bfin)
+        arch="bfin"
+    ;;
+    ia64)
+        arch="ia64"
         enable fast_64bit
-        enable fast_unaligned
+    ;;
+    m68k)
+        arch="m68k"
     ;;
     mips|mipsel|IP*)
         arch="mips"
@@ -1405,17 +1391,6 @@ EOF
         arch="mips"
         enable fast_64bit
     ;;
-    sun4u|sparc64)
-        arch="sparc"
-        subarch="sparc64"
-        enable fast_64bit
-    ;;
-    sparc)
-        arch="sparc"
-    ;;
-    sh4|sh)
-        arch="sh4"
-    ;;
     parisc|hppa)
         arch="parisc"
     ;;
@@ -1423,18 +1398,43 @@ EOF
         arch="parisc"
         enable fast_64bit
     ;;
+    "Power Macintosh"|ppc|powerpc)
+        arch="ppc"
+        enable fast_unaligned
+    ;;
+    ppc64)
+        arch="ppc"
+        enable fast_64bit
+        enable fast_unaligned
+    ;;
     s390|s390x)
         arch="s390"
     ;;
-    m68k)
-        arch="m68k"
+    sh4|sh)
+        arch="sh4"
     ;;
-    ia64)
-        arch="ia64"
+    sparc)
+        arch="sparc"
+    ;;
+    sun4u|sparc64)
+        arch="sparc"
+        subarch="sparc64"
         enable fast_64bit
     ;;
-    bfin)
-        arch="bfin"
+    i386|i486|i586|i686|i86pc|BePC)
+        arch="x86"
+        subarch="x86_32"
+        enable fast_unaligned
+    ;;
+    x86_64|amd64)
+        arch="x86"
+        subarch="x86_32"
+        enable cmov
+        enable fast_cmov
+        enable fast_unaligned
+        check_cc <<EOF && enable fast_64bit && subarch="x86_64"
+        int test[sizeof(char*) - 7];
+EOF
     ;;
     *)
         arch="unknown"