Regenerate riscv.opt.urls and i386.opt.urls

risc-v added an -mfence-tso option. i386 removed Xeon Phi ISA support
options. But the opt.urls files weren't regenerated.

Fixes: a6114c2a ("RISC-V: Implement -m{,no}fence-tso")
Fixes: e1a7e2c5 ("i386: Remove Xeon Phi ISA support")

gcc/ChangeLog:

	* config/riscv/riscv.opt.urls: Regenerate.
	* config/i386/i386.opt.urls: Likewise.