pldm: change utils.cpp to a shared library

pldmtool is a separate executable that depends on utils.cpp.
Compile utils.cpp to a shared libaray so that it could be linked against
by components.

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I25086d543746a220ff257b0b53101f4e61e28b95
diff --git a/tool/meson.build b/tool/meson.build
index 1c55710..95f746c 100644
--- a/tool/meson.build
+++ b/tool/meson.build
@@ -9,6 +9,6 @@
   'pldmtool',
   sources,
   implicit_include_directories: false,
-  dependencies: libpldm,
+  dependencies: [libpldm, libpldmutils],
   install: true,
   install_dir: get_option('bindir'))