pwd_grp_internal.c: do not include pthread.h

stdio.h provides __STDIO* locking related macros

Signed-off-by: Peter S. Mazinger <ps.m@gmx.net>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

libc/pwd_grp/pwd_grp_internal.c

@@ -34,9 +34,6 @@
 #ifdef __UCLIBC_HAS_SHADOW__
 #include <shadow.h>
 #endif
-#ifdef __UCLIBC_HAS_THREADS__
-#include <pthread.h>
-#endif
 
 /**********************************************************************/
 /* Sizes for statically allocated buffers. */