multimedia/x265: unbreak on aarch64[1] and mips

/usr/bin/ld: common/CMakeFiles/common.dir/common.cpp.o: relocation R_AARCH64_ADR_PREL_PG_HI21 against external symbol `stderrp@@FBSD_1.0' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: common/CMakeFiles/common.dir/common.cpp.o(.text+0x1e0): unresolvable R_AARCH64_ADR_PREL_PG_HI21 relocation against symbol `stderrp@@FBSD_1.0'
/usr/bin/ld: final link failed: Bad value

/usr/bin/ld: x265: hidden symbol `__sync_fetch_and_add_4' in /usr/lib/libgcc.a(stdatomic.o) is referenced by DSO
/usr/bin/ld: final link failed: Nonrepresentable section on output

PR: 216473 [1]
Reported by: pkg-fallout
Submitted by: mikael.urankar@gmail.com [1]
Approved by: portmgr blanket