wscript: don't set subsystem flag, it's only needed for executables

Author: a1batross

cl_dll/wscript

@@ -119,7 +119,6 @@ def build(bld):
 		defines  = defines,
 		use      = libs,
 		install_path = install_path,
-		subsystem = bld.env.MSVC_SUBSYSTEM,
 		idx = bld.get_taskgen_count()
 	)
 

dlls/wscript

@@ -54,7 +54,6 @@ def build(bld):
 		includes = includes,
 		defines  = defines,
 		install_path = install_path,
-		subsystem = bld.env.MSVC_SUBSYSTEM,
 		idx = bld.get_taskgen_count()
 	)
 

wscript

@@ -47,12 +47,6 @@ def configure(conf):
 	conf.load('fwgslib reconfigure compiler_optimizations')
 	conf.env.MSVC_TARGETS = ['x86' if not conf.options.ALLOW64 else 'x64']
 
-	# Force XP compatibility, all build targets should add subsystem=bld.env.MSVC_SUBSYSTEM
-	if conf.env.MSVC_TARGETS[0] == 'x86':
-		conf.env.MSVC_SUBSYSTEM = 'WINDOWS,5.01'
-	else:
-		conf.env.MSVC_SUBSYSTEM = 'WINDOWS'
-
 	# Load compilers early
 	conf.load('xcompile compiler_c compiler_cxx gccdeps')