Remove legacy build system

glslang/OSDependent/Unix/Makefile

@@ -1,61 +0,0 @@
-####
-#### This Makefile should be used in the Linux Compiler build.  This Makefile build the OSDependent 
-#### component as a static library.
-####
-
-#
-# Compilation related
-#
-INCLUDE = -I. -I../.. -I../../Include -I../../../OGLCompilersDLL 
-WARNINGS = -Wall -Wwrite-strings -Wpointer-arith -Wcast-align -Wstrict-prototypes \
-	-Wnested-externs
-  
-CPP = g++
-CPPOPTIONS = -O3 -Wno-deprecated -D_ALT_NS=1 -fPIC
-CPPOPTIONS = -g -Wno-deprecated -D_ALT_NS=1 -fPIC
-CPPFLAGS = $(CPPOPTIONS) $(INCLUDE)
-
-#
-# Linking related
-#
-AR = ar
-STATIC_OPTION = rcs
-
-#
-# Misc
-#
-export PERL = perl
-export RM = rm -f
-export MV = mv -f
-export DEPEND = g++ -M
-
-#
-# Object file variables are defined here.
-#
-OSSRCS = ossource.cpp
-OSOBJS = ossource.o
-
-LIBNAME = libOssource.a
-
-all : $(LIBNAME)
-
-$(LIBNAME) : $(OSOBJS)
-	 $(AR) $(STATIC_OPTION) $(LIBNAME) $(OSOBJS) 
-
-%.o : %.cpp
-	$(CPP) $(CPPFLAGS) -c $<
-
-
-#
-# Dependency
-#
-depend : $(OSSRCS)
-	$(DEPEND) $(CPPFLAGS) $(OSSRCS) > depend
-include depend
-
-#
-# Cleanup
-#
-.PHONY : clean
-clean :
-	$(RM) *.o *.a