use BUILD_EXE for flisp

(cherry picked from commit 98ff594)

Author: vchuravy

src/Makefile

@@ -143,8 +143,8 @@ FLISPDIR := $(BUILDDIR)/flisp/host
 else
 FLISPDIR := $(BUILDDIR)/flisp
 endif
-FLISP_EXECUTABLE_debug := $(FLISPDIR)/flisp-debug$(EXE)
-FLISP_EXECUTABLE_release := $(FLISPDIR)/flisp$(EXE)
+FLISP_EXECUTABLE_debug := $(FLISPDIR)/flisp-debug$(BUILD_EXE)
+FLISP_EXECUTABLE_release := $(FLISPDIR)/flisp$(BUILD_EXE)
 ifeq ($(OS),WINNT)
 FLISP_EXECUTABLE := $(FLISP_EXECUTABLE_release)
 else