Fix brew build: remove redundant explicit copy (#724)

* remove redundant explicit copy

* fix build

Makefile.in

@@ -5,12 +5,7 @@ include $(topsrcdir)config.make
 restore:
 	MONO_ENV_OPTIONS=$(monoopts) mono .nuget/NuGet.exe restore packages.config -PackagesDirectory packages -ConfigFile .nuget/NuGet.Config
 
-# We need the bootstrap's FSharp.Core to run the proto
-build-proto: restore $(bootstrap)/FSharp.Core.dll $(bootstrap)/FSharp.Core.sigdata $(bootstrap)/FSharp.Core.optdata
-	@-mkdir -p $(protodir)
-	cp -p $(bootstrap)/FSharp.Core.dll $(protodir)FSharp.Core.dll
-	cp -p $(bootstrap)/FSharp.Core.sigdata $(protodir)FSharp.Core.sigdata
-	cp -p $(bootstrap)/FSharp.Core.optdata $(protodir)FSharp.Core.optdata
+build-proto: restore
 	$(MAKE) -C src/fsharp/FSharp.Build-proto Configuration=Proto $@
 	$(MAKE) -C src/fsharp/FSharp.Compiler-proto Configuration=Proto $@
 	$(MAKE) -C src/fsharp/Fsc-proto Configuration=Proto $@

configure.ac

@@ -75,12 +75,10 @@ if ! test "x$with_gacdir" = "xno"; then
 	MONOGACDIR=$(cd "$with_gacdir/.." && pwd)
 fi
 
-MONOGACDIR20="$MONOGACDIR"/2.0
-MONOGACDIR35="$MONOGACDIR"/3.5
 MONOGACDIR40="$MONOGACDIR"/4.0
 MONOGACDIR45="$MONOGACDIR"/4.5
 
-if ! test -e $MONOGACDIR20/mscorlib.dll -o -e $MONOGACDIR45/mscorlib.dll; then
+if ! test -e $MONOGACDIR45/mscorlib.dll; then
 	AC_ERROR(Couldn't find the mono gac directory or mscorlib.dll in the usual places. Set --with-gacdir=<path>)
 fi