Change libtinfo fatal error to a warning also on dynamic build

ncurses builds it as a built-in module by default, and this is how
it is deployed on most systems.

CMakeLists.txt

@@ -235,11 +235,7 @@ if(CURSES_LIBRARY)
       target_link_libraries(sipp ${TINFO_LIBRARY})
       target_link_libraries(sipp_unittest ${TINFO_LIBRARY})
     else()
-      if(BUILD_STATIC)
-        message(WARNING "libtinfo.a was not found -- please install package if linking fails")
-      else()
-        message(FATAL_ERROR "libtinfo.so was not found -- please install package")
-      endif(BUILD_STATIC)
+      message(WARNING "libtinfo was not found -- please install package if linking fails")
     endif(TINFO_LIBRARY)
   endif(CMAKE_SYSTEM_NAME STREQUAL "Linux")
   if(CURSES_LIBRARY_INCLUDE_DIRS OR TINFO_LIBRARY_INCLUDE_DIRS)