use correct path separator

Linux uses `:` as path separator, not `;` like Windows.

Author: egavazzi

src/MATLAB.jl

@@ -81,8 +81,10 @@ function __init__()
 
     # load libraries
     # workaround for https://github.com/JuliaInterop/MATLAB.jl/issues/200
-    if Sys.iswindows() || Sys.islinux()
+    if Sys.iswindows()
         ENV["PATH"] = string(matlab_libpath, ";", ENV["PATH"])
+    elseif Sys.islinux()
+        ENV["PATH"] = string(matlab_libpath, ":", ENV["PATH"])
     end
     libmx[]  = Libdl.dlopen(joinpath(matlab_libpath, "libmx"), Libdl.RTLD_GLOBAL)
     libmat[] = Libdl.dlopen(joinpath(matlab_libpath, "libmat"), Libdl.RTLD_GLOBAL)