Move sc to homebrew-alt

sc is not currently maintained and requires extensive
patching for OS X, so moving to homebrew-alt repo.

Formula/sc.rb

@@ -1,63 +0,0 @@
-require 'formula'
-
-class Sc <Formula
-  url 'http://www.ibiblio.org/pub/linux/apps/financial/spreadsheet/sc-7.16.tar.gz'
-  homepage 'http://www.ibiblio.org/pub/linux/apps/financial/spreadsheet/sc-7.16.lsm'
-  md5 '1db636e9b2dc7cd73c40aeece6852d47'
-
-  skip_clean 'share/sc/plugins'
-
-  def install
-    inreplace 'Makefile' do |s|
-      s.change_make_var! 'prefix', prefix
-      s.change_make_var! 'EXDIR', bin
-      s.change_make_var! 'MANDIR', man1
-      s.change_make_var! 'LIBDIR', "#{share}/sc"
-    end
-    system "make install"
-  end
-
-  def patches
-    # The Makefile for sc 7.16 doesn't work well with dirs like Homebrew uses;
-    # also, it looks unmaintained, so these changes are unlikely to be applied
-    DATA
-  end
-
-end
-
-__END__
-
-diff --git a/Makefile b/Makefile
-index f3007b4..2e3a73c 100644
---- a/Makefile
-+++ b/Makefile
-@@ -499,14 +499,17 @@ install: $(EXDIR)/$(name) $(EXDIR)/$(name)qref $(EXDIR)/p$(name) \
- 	 $(MANDIR)/p$(name).$(MANEXT)
- 
- $(EXDIR)/$(name): $(name)
-+	-mkdir -p $(EXDIR)
- 	cp $(name) $(EXDIR)
- 	strip $(EXDIR)/$(name)
- 
- $(EXDIR)/$(name)qref: $(name)qref
-+	-mkdir -p $(EXDIR)
- 	cp $(name)qref $(EXDIR)
- 	strip $(EXDIR)/$(name)qref
- 
- $(EXDIR)/p$(name): p$(name)
-+	-mkdir -p $(EXDIR)
- 	cp p$(name) $(EXDIR)
- 	strip $(EXDIR)/p$(name)
- 
-@@ -516,9 +519,10 @@ $(LIBDIR)/tutorial: tutorial.sc $(LIBDIR)
- 	chmod $(MANMODE) $(LIBDIR)/tutorial.$(name)
- 
- $(LIBDIR):
--	mkdir $(LIBDIR)
-+	-mkdir -p $(LIBDIR)
- 
- $(MANDIR)/$(name).$(MANEXT): $(name).1
-+	-mkdir -p $(MANDIR)
- 	cp $(name).1 $(MANDIR)/$(name).$(MANEXT)
- 	chmod $(MANMODE) $(MANDIR)/$(name).$(MANEXT)
-