eina_cpu - up max number of threads to 32

this should be better for todays systems - max number of cores we can
query for now is 32.

@feature

src/lib/eina/eina_cpu.c

@@ -37,7 +37,7 @@
 # endif
 # include <pthread.h>
 
-# define TH_MAX 8
+# define TH_MAX 32
 #endif
 
 #include <stdlib.h>