deps(pystring): adjust build recipe in attempt to fix CI failure

_Occasionally_, libpystring can't be re-found once it's built, and it's not clear why. Attempting various tiny changes to see if I can figure out what's going wrong where ....

Signed-off-by: Zach Lewis <zachcanbereached@gmail.com>

src/cmake/build_pystring.cmake

@@ -29,12 +29,15 @@ build_dependency_with_cmake(pystring
         -D CMAKE_INSTALL_LIBDIR=lib
 )
 
-set (pystring_ROOT ${pystring_LOCAL_INSTALL_DIR})
+#set (pystring_ROOT ${pystring_LOCAL_INSTALL_DIR})
 set (pystring_VERSION ${pystring_BUILD_VERSION})
+
 set (pystring_REFIND TRUE)
 set (pystring_REFIND_ARGS REQUIRED)
 set (pystring_REFIND_VERSION ${pystring_BUILD_VERSION})
 
+#find_package(pystring REQUIRED)
+
 if (pystring_BUILD_SHARED_LIBS)
     install_local_dependency_libs (pystring pystring)
 endif ()