Allow generating modules once per OS instead of once per Class

When building with two OSes of the same class (Host, etc) enabled,
independently produce variants of each module for each OS, instead of
making `compile_multilib: "first"` select just one of the OSes.

My use case this is for Linux + LinuxBionic, which are both considered
Host class, but this would also applied if we wanted to generate rules
for Linux+Darwin, or some combination of firmware bits (either in
addition to Android in the Device Class, or multiple firmwares in a new
Class)

Bug: 31559095
Test: enable host bionic, see a linux(_glibc) and linux_bionic
      definition for binaries
Change-Id: I55e7f046758b3dc2a31da2c4b20274ec68ece0a0

0 files changed, 0 insertions, 0 deletions