Add Jamfile for x86 libunwind

src/libs/libunwind/x86/Jamfile

@@ -0,0 +1,32 @@
+SubDir HAIKU_TOP src libs libunwind x864 ;
+
+UseLibraryHeaders libunwind ;
+SubDirHdrs [ FDirName $(SUBDIR) $(DOTDOT) ] ;
+SubDirCcFlags [ FDefines HAVE_CONFIG_H=1 ] ;
+
+MergeObject libunwind_x86.o :
+	Gcreate_addr_space.c
+	Gget_proc_info.c
+	Gget_save_loc.c
+	Gglobal.c
+	Ginit.c
+	Ginit_local.c
+	Ginit_remote.c
+	Gregs.c
+	Gresume.c
+	Gstep.c
+	Lcreate_addr_space.c
+	Lget_proc_info.c
+	Lget_save_loc.c
+	Lglobal.c
+	Linit.c
+	Linit_local.c
+	Linit_remote.c
+	Lregs.c
+	Lresume.c
+	Lstep.c
+	is_fpreg.c
+	longjmp.S
+	regname.c
+	siglongjmp.S
+;