simplify the way we disable sanitizers for yasm
simplify the way we disable sanitizers for yasm

seems to work fine

CQ_EXTRA_TRYBOTS=client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug-ASAN-Trybot

BUG=skia:

Review URL: https://codereview.chromium.org/1505013003

tmpvar/skia.cc,Hikari-no-Tenshi/android_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,qrealka/skia-hc,rubenvb/skia,rubenvb/skia,google/skia,HalCanary/skia-hc,rubenvb/skia,google/skia,rubenvb/skia,google/skia,aosp-mirror/platform_external_skia,Hikari-no-Tenshi/android_external_skia,tmpvar/skia.cc,HalCanary/skia-hc,HalCanary/skia-hc,qrealka/skia-hc,rubenvb/skia,qrealka/skia-hc,aosp-mirror/platform_external_skia,Hikari-no-Tenshi/android_external_skia,Hikari-no-Tenshi/android_external_skia,rubenvb/skia,qrealka/skia-hc,HalCanary/skia-hc,google/skia,aosp-mirror/platform_external_skia,HalCanary/skia-hc,tmpvar/skia.cc,HalCanary/skia-hc,qrealka/skia-hc,aosp-mirror/platform_external_skia,rubenvb/skia,google/skia,tmpvar/skia.cc,Hikari-no-Tenshi/android_external_skia,tmpvar/skia.cc,google/skia,google/skia,google/skia,Hikari-no-Tenshi/android_external_skia,aosp-mirror/platform_external_skia,qrealka/skia-hc,tmpvar/skia.cc,tmpvar/skia.cc,qrealka/skia-hc,google/skia,HalCanary/skia-hc,rubenvb/skia,google/skia,Hikari-no-Tenshi/android_external_skia,HalCanary/skia-hc,HalCanary/skia-hc,rubenvb/skia,HalCanary/skia-hc,tmpvar/skia.cc,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,qrealka/skia-hc,Hikari-no-Tenshi/android_external_skia,aosp-mirror/platform_external_skia,tmpvar/skia.cc,rubenvb/skia