Adjust Makefile to compile libx86info.so

From: Thomas Renninger <trenn@suse.de>

Index: x86info-1.24/Makefile
===================================================================
--- x86info-1.24.orig/Makefile
+++ x86info-1.24/Makefile
@@ -1,4 +1,4 @@
-CFLAGS = -g -O2 -Werror -Wall -Wshadow -Wextra -Wmissing-declarations -Wdeclaration-after-statement -Wredundant-decls
+override CFLAGS = -g -O2 -Werror -Wall -Wshadow -Wextra -Wmissing-declarations -Wdeclaration-after-statement -Wredundant-decls
 CC = gcc
 
 SHELL = /bin/sh
@@ -15,7 +15,7 @@ SHELL = /bin/sh
 	$(CC) $(CFLAGS) -o $@ -c $<
 
 
-all: x86info test lsmsr
+all: x86info test lsmsr libx86info.so
 
 
 LSMSR_TMP_HEADERS=AMD/k8.h AMD/fam10h.h generic_msr.h
@@ -77,9 +77,8 @@ X86INFO_SRC =\
 	dumpregs.c\
 	features.c\
 	identify.c\
-	msr.c\
 	dumpmsr.c\
-	binary.c\
+		binary.c\
 	mptable.c\
 	get_model_name.c\
 	mtrr.c \
@@ -90,11 +89,18 @@ X86INFO_SRC =\
 
 X86INFO_OBJS = $(X86INFO_SRC:%.c=%.o)
 
-x86info: $(X86INFO_OBJS)
-	$(CC) $(CFLAGS) -o x86info $(X86INFO_OBJS)
+x86info: $(X86INFO_OBJS) libx86info.so
+	$(CC) $(CFLAGS) -o x86info $(X86INFO_OBJS) -L. -lx86info
 
 -include $(X86INFO_SRC:%.c=%.P)
 
+msr.o: CFLAGS += -fPIC
+
+libx86info.so.1: msr.o
+	${CC} -shared -Wl,-soname=libx86info.so.1 -o libx86info.so.1 $^
+
+libx86info.so: libx86info.so.1
+	ln -sf libx86info.so.1 libx86info.so
 
 nodes:
 	scripts/makenodes