testsuite: RISC-V: Ignore pr118170.c for E ABI

The -mcpu=tt-ascalon-d8 option for the test implies D extension, which
is not compatible with the ILP32E and ILP64E ABIs.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/pr118170.c: Ignore for E ABI.

Signed-off-by: Dimitar Dimitrov <dimitar@dinux.eu>

gcc/testsuite/gcc.target/riscv/pr118170.c

-/* { dg-do "compile" } */
+/* { dg-do "compile" { target { ! riscv_abi_e } } } */
 /* { dg-options "-O2 -mcpu=tt-ascalon-d8" } */
 _Float16 f;