Fix linking to renamed openblas, ref JuliaLang#13407

Author: tkelman

Make.inc

@@ -916,6 +916,8 @@ ifeq ($(USE_SYSTEM_BLAS), 0)
 ifeq ($(USE_BLAS64), 1)
 OPENBLAS_SYMBOLSUFFIX := 64_
 OPENBLAS_LIBNAMESUFFIX := 64_
+LIBBLAS := -L$(build_shlibdir) -lopenblas$(OPENBLAS_LIBNAMESUFFIX)
+LIBLAPACK := $(LIBBLAS)
 LIBBLASNAME := $(LIBBLASNAME)$(OPENBLAS_LIBNAMESUFFIX)
 LIBLAPACKNAME := $(LIBBLASNAME)
 endif