Fix LZMA string.h header inclusion issue and remove unused variables.

Signed-off-by: Luigi 'Comio' Mantellini <luigi.mantellini@idf-hit.com>
diff --git a/lib_generic/lzma/Makefile b/lib_generic/lzma/Makefile
index 2916f21..57f03b0 100644
--- a/lib_generic/lzma/Makefile
+++ b/lib_generic/lzma/Makefile
@@ -30,7 +30,7 @@
 
 SOBJS	=
 
-CFLAGS += -D_LZMA_PROB32 -I$(TOPDIR)/include/linux
+CFLAGS += -D_LZMA_PROB32
 
 COBJS-$(CONFIG_LZMA) += LzmaDec.o LzmaTools.o