Looks like we are missing these flags only in sanitizer-common, which results in linker warnings in some settings.
For example, we are not setting the minimal deployment target on the tests but are setting the minimal deployment target for the sanitizer library, which leads to the following warning on some bots: ld: warning: object file (sanitizer_posix_test.cc.i386.o) was built for newer OSX version (10.12) than being linked (10.11).