Detect ARM CPU version in configure

Instead of guessing the ARM CPU version to compile for from tcc.h, we
now detect it in configure and output the value in config.h

configure

@@ -51,7 +51,21 @@ case "$cpu" in
   x86_64)
     cpu="x86-64"
   ;;
-  arm|armv4l|armv5tel|armv5tejl|armv6j|armv6l|armv7a|armv7l)
+  arm*)
+    case "$cpu" in
+      arm|armv4l)
+        cpuver=4
+      ;;
+      armv5tel|armv5tejl)
+        cpuver=5
+      ;;
+      armv6j|armv6l)
+        cpuver=6
+      ;;
+      armv7a|armv7l)
+        cpuver=7
+      ;;
+    esac
     cpu="armv4l"
   ;;
   alpha)
@@ -411,6 +425,7 @@ elif test "$cpu" = "x86-64" ; then
 elif test "$cpu" = "armv4l" ; then
   echo "ARCH=arm" >> config.mak
   echo "#define HOST_ARM 1" >> $TMPH
+  echo "#define TCC_ARM_VERSION $cpuver" >> $TMPH
 elif test "$cpu" = "powerpc" ; then
   echo "ARCH=ppc" >> config.mak
   echo "#define HOST_PPC 1" >> $TMPH