attempt to fix RPM spec file after recent soversion bump

In Ic66eb67254d35f02ec8cdea4d79fa4b1899e8230 the soversion was
chhanged (e.g. libosmoabis.so.9 to libosmoabis.so.10) but the
spec.in file was not adjusted accordingly.

Change-Id: I0ca9eb5a60557a1bc8e3611fdd2668469ac19031
diff --git a/contrib/libosmo-abis.spec.in b/contrib/libosmo-abis.spec.in
index 2448564..629db97 100644
--- a/contrib/libosmo-abis.spec.in
+++ b/contrib/libosmo-abis.spec.in
@@ -127,7 +127,7 @@
 
 %files -n libosmoabis10
 %defattr(-,root,root)
-%_libdir/libosmoabis.so.9*
+%_libdir/libosmoabis.so.10*
 
 %files -n libosmoabis-devel
 %defattr(-,root,root)