[Eva] Fixes some tests.

tests/value/memexec.c

 /* run.config*
-   STDOPT: +"-rte-select fbug @RTE_TEST@ -then -eva"
+   PLUGIN: @PTEST_PLUGIN@ rtegen
+   STDOPT: #"-machdep x86_32 -rte-select fbug @RTE_TEST@ -then -eva"
 */
-
 int x1, y1, z1, z2; volatile int c, nondet;
 
 void f11() {

tests/value/oracle/summary.4.res.oracle

-[kernel] Warning: -slevel is a deprecated alias for option -eva-slevel.
-  Please use -eva-slevel instead.
 [kernel] Parsing summary.i (no preprocessing)
 [rte:annot] annotating function alarms
 [rte:annot] annotating function bottom
@@ -8,6 +6,8 @@
 [rte:annot] annotating function logic
 [rte:annot] annotating function main
 [rte:annot] annotating function minimal
+[kernel] Warning: -slevel is a deprecated alias for option -eva-slevel.
+  Please use -eva-slevel instead.
 [eva] Analyzing a complete application starting at main
 [eva] Computing initial state
 [eva] Initial state computed
@@ -107,7 +107,7 @@
   ----------------------------------------------------------------------------
   Some errors and warnings have been raised during the analysis:
     by the Eva analyzer:      0 errors    1 warning
-    by the Frama-C kernel:    0 errors    2 warnings
+    by the Frama-C kernel:    0 errors    3 warnings
   ----------------------------------------------------------------------------
   18 alarms generated by the analysis:
        3 invalid memory accesses

tests/value/summary.i

@@ -3,8 +3,8 @@
   STDOPT: +"-eva-msg-key=summary -main minimal"
   STDOPT: +"-eva-msg-key=summary -main bottom"
   STDOPT: +"-eva-msg-key=summary -main main"
-PLUGIN: @PTEST_PLUGIN@ rtegen
-  STDOPT: +"@RTE_TEST@ -eva-msg-key=summary -main main -slevel 0"
+  PLUGIN: @PTEST_PLUGIN@ rtegen
+  OPT: -machdep x86_32 @RTE_TEST@ -then @EVA_TEST@ -eva-msg-key=summary -main main -slevel 0
 */
 /* Tests the summary on the smallest possible program. */
 void minimalist ();