fixed bytecode-only compilation

.gitignore

@@ -76,6 +76,7 @@ why3.conf
 /bin/why3stats.opt
 /bin/why3stats
 /bin/why3session.opt
+/bin/why3session.byte
 /bin/why3session
 
 # /doc/

Makefile.in

@@ -460,8 +460,8 @@ $(MLWCMO) $(MLWCMX): INCLUDES += -I src/whyml
 
 # build targets
 
-byte: $(MLWCMX)
-opt:  $(MLWCMO)
+byte: $(MLWCMO)
+opt:  $(MLWCMX)
 
 # depend and clean targets