Improve MS-Windows implementation in dynlib.c
* src/dynlib.c [WINDOWSNT]: Include errno.h, lisp.h, and w32.h. No need to include windows.h, as w32.h already does that. <dynlib_last_err>: New static variable. (dynlib_reset_last_error): New function. (dynlib_open): Convert forward slashes to backslashes. Convert file names from UTF-8 to either UTF-16 or the current ANSI codepage, and call either LoadLibraryW or LoadLibraryA. If the argument is NULL, return a handle to the main module, like 'dlopen' does. Record the error, if any, for use by dynlib_error. (dynlib_sym): Check the handle for validity. Record the error, if any, for use by dynlib_error. (dynlib_error): Call w32_strerror to produce the error string, and zero out the last error code, like dlerror does. (dynlib_close): Check the handle for validity. Record the error, if any, for use by dynlib_error. Don't call FreeLibrary with a handle for the main module. * src/w32.c (globals_of_w32): Call dynlib_reset_last_error.
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