Install dll to prefix/bin instead of prefix/bin

Makefile.install

@@ -7,6 +7,7 @@ PREFIX ?= /opt/OpenBLAS
 
 OPENBLAS_INCLUDE_DIR := $(PREFIX)/include
 OPENBLAS_LIBRARY_DIR := $(PREFIX)/lib
+OPENBLAS_BINARY_DIR := $(PREFIX)/bin
 OPENBLAS_BUILD_DIR := $(CURDIR)
 
 .PHONY : install
@@ -78,10 +79,10 @@ ifeq ($(OSNAME), Darwin)
 	@-ln -fs $(DESTDIR)$(OPENBLAS_LIBRARY_DIR)/$(LIBDYNNAME) $(DESTDIR)$(OPENBLAS_LIBRARY_DIR)/$(LIBPREFIX).dylib
 endif
 ifeq ($(OSNAME), WINNT)
-	@-cp $(LIBDLLNAME) $(OPENBLAS_LIBRARY_DIR)
+	@-cp $(LIBDLLNAME) $(OPENBLAS_BINARY_DIR)
 endif
 ifeq ($(OSNAME), CYGWIN_NT)
-	@-cp $(LIBDLLNAME) $(OPENBLAS_LIBRARY_DIR)
+	@-cp $(LIBDLLNAME) $(OPENBLAS_BINARY_DIR)
 endif
 endif