Don't bail out in the binary-dist target, if openblas

is not compiled with dynamic arch support.
This is not available on ARM, and in any case, it seems ok to
just print a warning.

Makefile

@@ -387,8 +387,8 @@ dist:
 binary-dist: distclean
 ifeq ($(USE_SYSTEM_BLAS),0)
 ifneq ($(OPENBLAS_DYNAMIC_ARCH),1)
-	@echo OpenBLAS must be rebuilt with OPENBLAS_DYNAMIC_ARCH=1 to use binary-dist target
-	@false
+       @echo OpenBLAS is not built with OPENBLAS_DYNAMIC_ARCH=1.
+       @echo This may lead to suboptimal performance on other architectures.
 endif
 endif
 ifneq ($(prefix),$(abspath julia-$(JULIA_COMMIT)))