Add 'c-c++-common/initpri1{,-lto,-split}-static.c' as internal linkage variants

Add 'c-c++-common/initpri1{,-lto,-split}-static.c' as internal linkage variants

	gcc/testsuite/
	* c-c++-common/initpri1_part_c1.c: Consider 'CDTOR_LINKAGE'.
	* c-c++-common/initpri1_part_c2.c: Likewise.
	* c-c++-common/initpri1_part_c3.c: Likewise.
	* c-c++-common/initpri1_part_cd4.c: Likewise.
	* c-c++-common/initpri1_part_d1.c: Likewise.
	* c-c++-common/initpri1_part_d2.c: Likewise.
	* c-c++-common/initpri1_part_d3.c: Likewise.
	* c-c++-common/initpri1.c: Specify it.
	* c-c++-common/initpri1-lto.c: Likewise.
	* c-c++-common/initpri1-split.c: Likewise.
	* c-c++-common/initpri1-static.c: New.
	* c-c++-common/initpri1-lto-static.c: Likewise.
	* c-c++-common/initpri1-split-static.c: Likewise.