libxencall: Bump SONAME following new functionality

Fixes: bef64f2c00 ("libxencall: introduce variant of xencall2() returning long")
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Ian Jackson <iwj@xenproject.org>
Backport-requested-by: Jan Beulich <jbeulich@suse.com>
(cherry picked from commit 01a2d001de)

tools/libs/call/Makefile

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