gcc/target.cmake: fix build with gcc-13

Configuration error:
| -- Configuring done (4.9s)
| CMake Error in CMakeLists.txt:
|   Target "zephyr_interface" contains relative path in its
|   INTERFACE_INCLUDE_DIRECTORIES:
|
|     "include-fixed"

With GCC-13, limits.h and syslimits.h header files
are always being installed to include folder.
https://gcc.gnu.org/git/gitweb.cgi?p=gcc.git;h=be9dd80f933480



Signed-off-by: Naveen Saini <naveen.kumar.saini@intel.com>