Replace gcc with $CXX in Makefile

Author: rasa

Makefile

@@ -10,7 +10,7 @@ PREFIX ?= /usr/local
 BINDIR ?= $(PREFIX)/bin
 MANDIR ?= $(PREFIX)/share/man
 
-SYS := $(shell gcc -dumpmachine)
+SYS := $(shell $(CXX) -dumpmachine)
 CYGWIN := $(findstring cygwin,$(SYS))
 MINGW32 := $(findstring mingw32,$(SYS))
 
@@ -84,7 +84,7 @@ CLEAN_TARGETS := clean-bin $(CLEAN_MAN_TARGETS-$(ENABLE_MAN))
 clean: $(CLEAN_TARGETS)
 
 clean-bin:
-	rm -f $(OBJFILES) git-crypt
+	rm -f $(OBJFILES) git-crypt git-crypt.exe
 
 clean-man:
 	rm -f man/man1/git-crypt.1