Remove plenty of makefile misconfigurations

third_party/libcxx/__mutex_base

@@ -15,7 +15,9 @@
 #include "third_party/libcxx/system_error"
 #include "third_party/libcxx/__threading_support"
 
-#include "libc/isystem/time.h"
+#include "libc/sysv/consts/sched.h"
+#include "libc/time/struct/tm.h"
+#include "libc/time/time.h"
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #pragma GCC system_header

third_party/libcxx/string.h

@@ -57,7 +57,8 @@ size_t strlen(const char* s);
 #pragma GCC system_header
 #endif
 
-#include "libc/isystem/string.h"
+#include "libc/alg/alg.h"
+#include "libc/str/str.h"
 
 // MSVCRT, GNU libc and its derivates may already have the correct prototype in
 // <string.h>. This macro can be defined by users if their C library provides

third_party/libcxx/wchar.h

@@ -9,7 +9,8 @@
 
 #ifndef _LIBCPP_WCHAR_H
 #define _LIBCPP_WCHAR_H
-#include "libc/isystem/wchar.h"
+#include "libc/str/str.h"
+#include "libc/time/time.h"
 
 /*
     wchar.h synopsis

third_party/libcxx/wctype.h

@@ -50,7 +50,8 @@ wctrans_t wctrans(const char* property);
 #pragma GCC system_header
 #endif
 
-#include "libc/isystem/wctype.h"
+#include "libc/str/str.h"
+#include "libc/time/time.h"
 
 #ifdef __cplusplus