remove stale code from posix_path, redo readme

code/user/personalities/posix/posix_path.c

@@ -4,11 +4,6 @@
 #include <string.h>
 #include "posix_path.h"
 
-// Implements the flip Slashes operation.
-static void FlipSlashes(char* s) {
-    for (; *s; s++) if (*s == '/') *s = '\\';
-}
-
 // Checks whether drive Mount.
 static int IsDriveMount(const char* p) {
     return p && p[0] == '/' && p[1] >= '0' && p[1] <= '7' &&
@@ -30,7 +25,6 @@ const char* PosixTranslatePath(const char* in, char* out, size_t outSize) {
         if (restLen + 4 > outSize) restLen = outSize - 4;
         memcpy(out + 3, rest, restLen);
         out[3 + restLen] = '\0';
-        FlipSlashes(out);
         return out;
     }
 
@@ -49,7 +43,6 @@ const char* PosixTranslatePath(const char* in, char* out, size_t outSize) {
         out[len] = '\0';
     }
 
-    FlipSlashes(out);
     return out;
 }