package: fix package version deduction

We should check if variables NEO_VERSION_MAJOR, NEO_VERSION_MINOR and
NEO_VERSION_BUILD are defined instead of checking for values. this
allows to set values like '0' which was expanded to false.

Change-Id: I0ceaf0e19053cae29bee78e77f574b92771e2d3f
Signed-off-by: Artur Harasimiuk <[email protected]>

Author: ArturHarasimiuk

package.cmake

@@ -22,13 +22,13 @@ if(UNIX)
   set(package_input_dir ${IGDRCL_BINARY_DIR}/packageinput)
   set(package_output_dir ${IGDRCL_BINARY_DIR}/packages)
 
-  if(NOT NEO_VERSION_MAJOR)
+  if(NOT DEFINED NEO_VERSION_MAJOR)
     set(NEO_VERSION_MAJOR 1)
   endif()
-  if(NOT NEO_VERSION_MINOR)
+  if(NOT DEFINED NEO_VERSION_MINOR)
     set(NEO_VERSION_MINOR 0)
   endif()
-  if(NOT NEO_VERSION_BUILD)
+  if(NOT DEFINED NEO_VERSION_BUILD)
     set(NEO_VERSION_BUILD 0)
   endif()