build: do not install libresource.so

Problem: libresource.so was previously a convenience library, but is
now installed by default. However, it has a generic name that could
easily become confusing, and is named simply `libresource.so`, which
doesn't follow standard shared library naming conventions.

Make libresource a static convenience library instead and do
not install it.  The library should be renamed something like
`libfluxion-resoruce.so` and possibly be versioned with an soname if
installed in the future.

Fixes #1093

resource/CMakeLists.txt

@@ -40,7 +40,7 @@ set(RESOURCE_HEADERS
     store/resource_graph_store.hpp
     )
 
-add_library(resource SHARED
+add_library(resource STATIC
     policies/dfu_match_locality.cpp
     policies/dfu_match_var_aware.cpp
     policies/dfu_match_policy_factory.cpp
@@ -87,8 +87,6 @@ target_link_libraries(resource PUBLIC
     jobspec_conv
     Boost::filesystem
     )
-install(TARGETS resource
-        LIBRARY)
 
 add_subdirectory(modules)
 add_subdirectory(reapi)