cmake: added library version information to the targets.

src/external/Nonlocal/CMakeLists.txt

@@ -31,6 +31,13 @@ add_library(PNL_PippardFitter SHARED
   PNL_StartupHandler.cpp
   PNL_StartupHandlerDict.cxx
 )
+
+#--- set target properties, e.g. version --------------------------------------
+set_target_properties(PNL_PippardFitter
+  PROPERTIES
+    VERSION ${PNL_PIPPARDFITTER_VERSION}
+)
+
 #--- make sure that the include directory is found ----------------------------
 target_include_directories(
   PNL_PippardFitter BEFORE PRIVATE