msys replace slashes used in io redirection

Co-authored-by: Алексей <[email protected]>
Co-authored-by: Christoph Reiter <[email protected]>
Co-authored-by: Naveen M K <[email protected]>

setup.py

@@ -698,7 +698,7 @@ def check_extension_import(self, ext):
     def add_multiarch_paths(self):
         # Debian/Ubuntu multiarch support.
         # https://wiki.ubuntu.com/MultiarchSpec
-        tmpfile = os.path.join(self.build_temp, 'multiarch')
+        tmpfile = os.path.join(self.build_temp, 'multiarch').replace('\\','/')
         if not os.path.exists(self.build_temp):
             os.makedirs(self.build_temp)
         ret = run_command(
@@ -723,7 +723,7 @@ def add_multiarch_paths(self):
         opt = ''
         if CROSS_COMPILING:
             opt = '-t' + sysconfig.get_config_var('HOST_GNU_TYPE')
-        tmpfile = os.path.join(self.build_temp, 'multiarch')
+        tmpfile = os.path.join(self.build_temp, 'multiarch').replace('\\','/')
         if not os.path.exists(self.build_temp):
             os.makedirs(self.build_temp)
         ret = run_command(
@@ -785,7 +785,7 @@ def add_search_path(line):
                 pass
 
     def add_cross_compiling_paths(self):
-        tmpfile = os.path.join(self.build_temp, 'ccpaths')
+        tmpfile = os.path.join(self.build_temp, 'ccpaths').replace('\\','/')
         if not os.path.exists(self.build_temp):
             os.makedirs(self.build_temp)
         # bpo-38472: With a German locale, GCC returns "gcc-Version 9.1.0
@@ -1053,7 +1053,7 @@ def detect_readline_curses(self):
         readline_termcap_library = ""
         curses_library = ""
         # Cannot use os.popen here in py3k.
-        tmpfile = os.path.join(self.build_temp, 'readline_termcap_lib')
+        tmpfile = os.path.join(self.build_temp, 'readline_termcap_lib').replace('\\','/')
         if not os.path.exists(self.build_temp):
             os.makedirs(self.build_temp)
         # Determine if readline is already linked against curses or tinfo.