JS2x: Detect the availability of biosemu automatically.

Since the biosemu code is optional, the config file now determines its
availability automatically.

Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com>

board-js2x/config

@@ -3,5 +3,11 @@ TARG=ppc64
 export FLAG="-DBIOSEMU"
 export CPUARCH=ppc970
 export CPUARCHDEF=-DCPU_PPC970
+
+ifneq ($(wildcard ../other-licence/x86emu/*.c),)
 export SNK_BIOSEMU_APPS=1
+else
+export SNK_BIOSEMU_APPS=0
+endif
+
 FLASH_SIZE=8388608