Renamed _INCLUDE_DIR -> _INCLUDE_DIRS & _LIBRARY -> _LIBRARIES

cmake_modules/wolfgnssConfig.cmake

 #edit the following line to add the librarie's header files
 FIND_PATH(
-    wolfgnss_INCLUDE_DIR
+    wolfgnss_INCLUDE_DIRS
     NAMES gnss.found
     PATHS /usr/local/include/iri-algorithms/wolf/plugin_gnss)
-IF(wolfgnss_INCLUDE_DIR)
-  MESSAGE("Found gnss include dirs: ${wolfgnss_INCLUDE_DIR}")
-ELSE(wolfgnss_INCLUDE_DIR)
+IF(wolfgnss_INCLUDE_DIRS)
+  MESSAGE("Found gnss include dirs: ${wolfgnss_INCLUDE_DIRS}")
+ELSE(wolfgnss_INCLUDE_DIRS)
   MESSAGE("Couldn't find gnss include dirs")
-ENDIF(wolfgnss_INCLUDE_DIR)
+ENDIF(wolfgnss_INCLUDE_DIRS)
 
 FIND_LIBRARY(
-    wolfgnss_LIBRARY
+    wolfgnss_LIBRARIES
     NAMES libwolfgnss.so
     PATHS /usr/local/lib/iri-algorithms)
-IF(wolfgnss_LIBRARY)
-  MESSAGE("Found gnss lib: ${wolfgnss_LIBRARY}")
-ELSE(wolfgnss_LIBRARY)
+IF(wolfgnss_LIBRARIES)
+  MESSAGE("Found gnss lib: ${wolfgnss_LIBRARIES}")
+ELSE(wolfgnss_LIBRARIES)
   MESSAGE("Couldn't find wolf gnss lib")
-ENDIF(wolfgnss_LIBRARY)
+ENDIF(wolfgnss_LIBRARIES)
 
-IF (wolfgnss_INCLUDE_DIR AND wolfgnss_LIBRARY)
+IF (wolfgnss_INCLUDE_DIRS AND wolfgnss_LIBRARIES)
    SET(wolfgnss_FOUND TRUE)
- ELSE(wolfgnss_INCLUDE_DIR AND wolfgnss_LIBRARY)
+ ELSE(wolfgnss_INCLUDE_DIRS AND wolfgnss_LIBRARIES)
    set(wolfgnss_FOUND FALSE)
-ENDIF (wolfgnss_INCLUDE_DIR AND wolfgnss_LIBRARY)
+ENDIF (wolfgnss_INCLUDE_DIRS AND wolfgnss_LIBRARIES)
 
 IF (wolfgnss_FOUND)
    IF (NOT wolfgnss_FIND_QUIETLY)
-      MESSAGE(STATUS "Found gnss: ${wolfgnss_LIBRARY}")
+      MESSAGE(STATUS "Found gnss: ${wolfgnss_LIBRARIES}")
    ENDIF (NOT wolfgnss_FIND_QUIETLY)
 ELSE (wolfgnss_FOUND)
    IF (wolfgnss_FIND_REQUIRED)
@@ -38,7 +38,7 @@ ENDIF (wolfgnss_FOUND)
 
 macro(wolf_report_not_found REASON_MSG)
   set(wolfgnss_FOUND FALSE)
-  unset(wolfgnss_INCLUDE_DIR)
+  unset(wolfgnss_INCLUDE_DIRS)
   unset(wolfgnss_LIBRARIES)
 
   # Reset the CMake module path to its state when this script was called.