Fix a typo

Author: DilumAluthge

test/runtests.jl

@@ -283,7 +283,7 @@ end
                 my_run(`$(GNUMake_jll.make())`)
 
                 env2 = copy(ENV)
-                if Sys.isapply()
+                if Sys.isapple()
                     env2["DYLD_FALLBACK_LIBRARY_PATH"] = "./MyLibCompiled/lib/:./MyLibCompiled/lib/julia"
                 else
                     # env2["LD_LIBRARY_PATH"] = "./MyLibCompiled/lib/:./MyLibCompiled/lib/julia"