Fixes --emit asm on windows and makes C header file generation explicit. (#1612)

* build: only do codegen_link when emitting an actual binary. Fixes #1371

* build: only output C header file when explicitely asked to
ba78ae0ae7Sahnvour committed on 9/30/2018, 8:59:45 PM· committed by Andrew Kelleyparent418b2e7
4 files changedLine totals unavailable