Makefile: Require the user to pass in CC

Author: Geod24

README.md

@@ -17,8 +17,8 @@ https://digitalmars.com/ctg/sc.html
 4. Change directory to `dm\src\dmc`
 5. Make sure the `dm\bin\make.exe` program is on your `PATH`.
 6. Execute the commands:
-   `make clean`
-   `make scppn`
+   `make CC=dmc clean`
+   `make CC=dmc scppn`
 You might need to edit the `makefile` to set the path to your DMD installation.
 
 Note that DMC runs on Win32, and hasn't been ported to other platforms.

dm/src/dmc/makefile

@@ -65,7 +65,7 @@ LFLAGS=/map/e/f/packcode/noe;
 # D compiler
 DMD=dmd
 # C++ compiler
-CC=dmc
+CC=
 # Make program
 MAKE=make
 # Librarian