kvm tools: Call executable 'lkvm' and add 'vm' alias

Several people have raised up the issue with our 'kvm' executable name. Rusty
came up with 'lkvm' which even Ingo is reasonably happy with:

  I could live with:

   - keeping 'tools/kvm/' as the tool project name

   - 'lkvm' as the binary

   - a command alias binary (hardlink) to 'vm'. I just checked,
     it's not used by any other package.

  ... and be done with it?

  'lkvm' rhymes nicely to 'lkml' as well, so it's not a 100% bad
  name.

Suggested-by: Rusty Russell <rusty@rustcorp.com.au>
Suggested-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

.gitignore

@@ -1,4 +1,5 @@
-/kvm
+/lkvm
+/vm
 *.o
 *.d
 .cscope

Makefile

@@ -23,7 +23,8 @@ FIND	:= find
 CSCOPE	:= cscope
 TAGS	:= ctags
 
-PROGRAM	:= kvm
+PROGRAM	:= lkvm
+PROGRAM_ALIAS := vm
 
 GUEST_INIT := guest/init
 GUEST_INIT_S2 := guest/init_stage2
@@ -209,7 +210,7 @@ WARNINGS += -Wwrite-strings
 
 CFLAGS	+= $(WARNINGS)
 
-all: arch_support_check $(PROGRAM) $(GUEST_INIT) $(GUEST_INIT_S2)
+all: arch_support_check $(PROGRAM) $(PROGRAM_ALIAS) $(GUEST_INIT) $(GUEST_INIT_S2)
 
 arch_support_check:
 	$(UNSUPP_ERR)
@@ -222,6 +223,10 @@ $(PROGRAM): $(DEPS) $(OBJS)
 	$(E) "  LINK    " $@
 	$(Q) $(CC) $(OBJS) $(LIBS) -o $@
 
+$(PROGRAM_ALIAS): $(PROGRAM)
+	$(E) "  LN      " $@
+	$(Q) ln -f $(PROGRAM) $@
+
 $(GUEST_INIT): guest/init.c
 	$(E) "  LINK    " $@
 	$(Q) $(CC) -static guest/init.c -o $@