create_config: remove *dir block

Now only the qemu_*dir variables will become #defines. The other
directory names aren't used by the C code.

That means the following #defines won't be available in C code anymore:

 - CONFIG_QEMU_BINDIR
 - CONFIG_QEMU_LIBDIR
 - CONFIG_QEMU_INCLUDEDIR
 - CONFIG_QEMU_MANDIR
 - CONFIG_QEMU_SYSCONFDIR
 - CONFIG_QEMU_LIBEXECDIR

The following #defines are going to be kept because they are handled by
the qemu_* block on create_config:

 - CONFIG_QEMU_CONFDIR
 - CONFIG_QEMU_DATADIR
 - CONFIG_QEMU_DOCDIR

This one will be kept because it is set directly by ./configure:

 - CONFIG_QEMU_HELPERDIR

This patch keeps the 'prefix=*' (CONFIG_QEMU_PREFIX) pattern because
other variables may use $prefix on their config-host.mak definitions.
The remaining code will be simplified on a further patch.
Signed-off-by: NEduardo Habkost <ehabkost@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

scripts/create_config

@@ -22,7 +22,7 @@ case $line in
     # save for the next definitions
     eval "$name=\$define_value"
     ;;
- prefix=* | [a-z]*dir=*) # directory configuration
+ prefix=*)
     name=${line%=*}
     value=${line#*=}
     define_name=`echo $name | LC_ALL=C tr '[a-z]' '[A-Z]'`