Fix bug introduced in commit c81d834b23446b10ac46c7f9378251baa11636b1
that installed libgccjit.h and libgccjitg++.h in
lib/gcc11/gcc/x86_64-portbld-freebsd13.1/include
instead of
/usr/local/lib/gcc11/gcc/x86_64-portbld-freebsd13.1/11.3.0/include
as it was intended.
PR: 257060
Reported by: yasu