[AArch64] Update target testcases for gnu11
gcc/testsuite/
* gcc.target/aarch64/pic-constantpool1.c: Add explicit declaration.
* gcc.target/aarch64/pic-symrefplus.c: Likewise.
* gcc.target/aarch64/reload-valid-spoff.c: Likewise.
* gcc.target/aarch64/vect.x: Likewise.
* gcc.target/aarch64/vect-ld1r.x: Add return type.
* gcc.target/aarch64/vect-fmax-fmin.c: Likewise.
* gcc.target/aarch64/vect-fp.c: Likewise.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@216544 138bc75d-0d04-0410-961f-82ee72b054a4