wscript: remove long_gcc for windows command line

waf now builds in support to detect the long command line problems
for windows.

Closes #5138.

long_gcc.py

@@ -1,45 +0,0 @@
-#! /usr/bin/env python3
-# encoding: utf-8
-
-"""
-def build(bld):
-	bld.load('long_gcc')
-"""
-
-import os, tempfile
-from waflib import Task
-
-def exec_command(self, cmd, **kw):
-	# workaround for command line length limit:
-	# http://support.microsoft.com/kb/830473
-	tmp = None
-	try:
-		if not isinstance(cmd, str) and len(str(cmd)) > 8192:
-			(fd, tmp) = tempfile.mkstemp(dir=self.generator.bld.bldnode.abspath())
-			flat = ['"%s"' % x.replace('\\', '\\\\').replace('"', '\\"') for x in cmd[1:]]
-			try:
-				os.write(fd, ' '.join(flat).encode())
-			finally:
-				if tmp:
-					os.close(fd)
-			# Line may be very long:
-			# Logs.debug('runner:' + ' '.join(flat))
-			cmd = [cmd[0], '@' + tmp]
-		ret = super(self.__class__, self).exec_command(cmd, **kw)
-	finally:
-		if tmp:
-			os.remove(tmp)
-	return ret
-
-def wrap_class(class_name):
-	cls = Task.classes.get(class_name)
-	if not cls:
-		return None
-	derived_class = type(class_name, (cls,), {})
-	derived_class.exec_command = exec_command
-	if hasattr(cls, 'hcode'):
-		derived_class.hcode = cls.hcode
-	return derived_class
-
-for k in 'c cxx cprogram cxxprogram cshlib cxxshlib cstlib cxxstlib'.split():
-	wrap_class(k)

wscript

@@ -1582,11 +1582,6 @@ def append_variant_builds(bld):
         waflib.Options.commands.append(bld.cmd + "_" + var)
 
 
-def long_command_line_workaround(bld):
-    if is_windows_host:
-        bld.load("long_gcc")
-
-
 def build(bld):
     if not bld.variant:
         check_forbidden_options(
@@ -1596,7 +1591,6 @@ def build(bld):
         load_items(bld, bld.env.SPECS)
         append_variant_builds(bld)
         return
-    long_command_line_workaround(bld)
     bic = BuildItemContext(bld.env.ARCH_INCLUDES.split(), [], [], [], [], [],
                            [])
     bsps[bld.env.ARCH][bld.env.BSP_BASE].build(bld, bic)