Fix incorrect relocations for x86.

These calls were not going through the PLT like they should have been.

Bug: 16853291
Change-Id: Id70488b077256a70137c4417f21be2c2d1d4341c
diff --git a/libc/tools/gensyscalls.py b/libc/tools/gensyscalls.py
index 96583d6..5a2d97b 100755
--- a/libc/tools/gensyscalls.py
+++ b/libc/tools/gensyscalls.py
@@ -170,7 +170,7 @@
     jb      1f
     negl    %%eax
     pushl   %%eax
-    call    __set_errno
+    call    PIC_PLT(__set_errno)
     addl    $4, %%esp
 1:
 """
@@ -192,7 +192,7 @@
     jb      1f
     negl    %%eax
     movl    %%eax, %%edi
-    call    __set_errno
+    call    PIC_PLT(__set_errno)
 1:
     ret
 END(%(func)s)