remove static makefile for linux (as static is default anyway)

make_static.linux

-KICAD_SUBDIRS =  common 3d-viewer eeschema eeschema/plugins pcbnew cvpcb kicad gerbview
-KICAD_SUBDIRS_BIN =  eeschema eeschema/plugins pcbnew cvpcb kicad gerbview
-
-# How to invoke make:
-MAKE = make -k -f makefile.gtk KICAD_STATIC_LINK=1
-MAKE_INSTALL = make -f makefile.gtk install
-
-ERASE = rm -f *.o
-
-all:
-	@for d in $(KICAD_SUBDIRS); do (cd $$d && $(MAKE)); done
-
-install:
-	@for d in $(KICAD_SUBDIRS_BIN); do (cd $$d && $(MAKE_INSTALL)); done
-
-clean:
-	@for d in $(KICAD_SUBDIRS); do (cd $$d && $(ERASE)); done