multilib-example.conf: explicitly overwrite the BASELIB

Currently, meta/conf/machine/include/x86/arch-x86.inc sets the BASE_LIB
for tune-x86 to "lib". Instead, explicitly overwrite the BASELIB to
better showcase what is happening inside.

(From OE-Core rev: 585fae415bd1161f5ac5fd17e4d3fedf4c91bf36)

Signed-off-by: Benjamin Bara <benjamin.bara@skidata.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta-skeleton/conf/multilib-example.conf

@@ -3,11 +3,12 @@
 # or specific in an configuration file like this, then require it.
 #
 # This configuration specifies an x86 64 bit machine as the main machine
-# type and then adds a multilib in the "lib32" directory where those
-# libraries are compiled with the "x86" tune.
+# type and then adds a multilib in the explicitly overwritten "lib32" directory
+# where those libraries are compiled with the "x86" tune.
 #
 
 MACHINE = "qemux86-64"
 require conf/multilib.conf
 MULTILIBS = "multilib:lib32"
 DEFAULTTUNE:virtclass-multilib-lib32 = "x86"
+BASELIB:virtclass-multilib-lib32 = "lib32"