Update to v5.0 kernel headers.

Test: Builds and boots on taimen.
Change-Id: I13843bf1ab30ea89a50852adc88f2cba8401bded
diff --git a/libc/tools/gensyscalls.py b/libc/tools/gensyscalls.py
index d78a5e7..9a3b95e 100755
--- a/libc/tools/gensyscalls.py
+++ b/libc/tools/gensyscalls.py
@@ -584,8 +584,15 @@
                          "kernel/uapi/asm-arm/asm/unistd-eabi.h",
                          "kernel/uapi/asm-arm/asm/unistd-oabi.h",
                          "kernel/uapi/asm-mips/asm/unistd.h",
+                         "kernel/uapi/asm-mips/asm/unistd_n32.h",
+                         "kernel/uapi/asm-mips/asm/unistd_n64.h",
+                         "kernel/uapi/asm-mips/asm/unistd_nr_n32.h",
+                         "kernel/uapi/asm-mips/asm/unistd_nr_n64.h",
+                         "kernel/uapi/asm-mips/asm/unistd_nr_o32.h",
+                         "kernel/uapi/asm-mips/asm/unistd_o32.h",
                          "kernel/uapi/asm-x86/asm/unistd_32.h",
-                         "kernel/uapi/asm-x86/asm/unistd_64.h"]:
+                         "kernel/uapi/asm-x86/asm/unistd_64.h",
+                         "kernel/uapi/asm-x86/asm/unistd_x32.h"]:
           for line in open(os.path.join(bionic_libc_root, unistd_h)):
             m = re.search(pattern, line)
             if m: