libs/devicemodel: Fix ABI breakage from xendevicemodel_set_irq_level()

It is not permitted to edit the VERS clause for a version in a release of Xen.

Revert xendevicemodel_set_irq_level()'s inclusion in .so.1.2 and bump the the
library minor version to .so.1.4 instead.

Fixes: 5d752df85f ("xen/dm: Introduce xendevicemodel_set_irq_level DM op")
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Ian Jackson <iwj@xenproject.org>
Release-Acked-by: Ian Jackson <iwj@xenproject.org>

tools/libs/devicemodel/Makefile

@@ -2,7 +2,7 @@ XEN_ROOT = $(CURDIR)/../../..
 include $(XEN_ROOT)/tools/Rules.mk
 
 MAJOR    = 1
-MINOR    = 3
+MINOR    = 4
 
 SRCS-y                 += core.c
 SRCS-$(CONFIG_Linux)   += common.c

tools/libs/devicemodel/libxendevicemodel.map

@@ -32,10 +32,14 @@ VERS_1.2 {
 	global:
 		xendevicemodel_relocate_memory;
 		xendevicemodel_pin_memory_cacheattr;
-		xendevicemodel_set_irq_level;
 } VERS_1.1;
 
 VERS_1.3 {
 	global:
 		xendevicemodel_modified_memory_bulk;
 } VERS_1.2;
+
+VERS_1.4 {
+	global:
+		xendevicemodel_set_irq_level;
+} VERS_1.3;