contrib: create static library for elfparser

I want to move a bunch of this "contrib" style sources into their own
area so we can statically link them but keep them separate from main
sysprof code.

contrib/elfparser/meson.build

@@ -0,0 +1,19 @@
+libelfparser_sources = [
+  'demangle.cpp',
+  'elfparser.c',
+]
+
+libelfparser_deps = [
+  dependency('glib-2.0', version: glib_req_version),
+]
+
+libelfparser_static = static_library('elfparser', libelfparser_sources,
+           dependencies: libelfparser_deps,
+  gnu_symbol_visibility: 'hidden',
+)
+
+libelfparser_static_dep = declare_dependency(
+  include_directories: include_directories('.'),
+         dependencies: libelfparser_deps,
+            link_with: libelfparser_static,
+)