cmake: drop unconditional forcing of CMAKE_SKIP_RPATH=TRUE

CMake "cache" entry for CMAKE_SKIP_RPATH is in the end of this file

platforms/linux/gnu.toolchain.cmake

@@ -56,8 +56,6 @@ else()
   endmacro()
 endif() # IN_TRY_COMPILE
 
-set(CMAKE_SKIP_RPATH TRUE)
-
 if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
   set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
 endif()