libc: silence warnings about undefined cpp tokens

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

libc/sysdeps/linux/arm/sysdep.h

@@ -158,7 +158,7 @@
 
 #define ret_ERRVAL PSEUDO_RET_NOERRNO
 
-#if NOT_IN_libc
+#if defined NOT_IN_libc
 # define SYSCALL_ERROR __local_syscall_error
 # ifdef RTLD_PRIVATE_ERRNO
 #  define SYSCALL_ERROR_HANDLER					\

libc/sysdeps/linux/i386/sysdep.h

@@ -243,7 +243,7 @@ __x86.get_pc_thunk.reg:						      \
 
 # elif defined _LIBC_REENTRANT
 
-#  if USE___THREAD
+#  if defined USE___THREAD
 #   ifndef NOT_IN_libc
 #    define SYSCALL_ERROR_ERRNO __libc_errno
 #   else

libc/sysdeps/linux/sh/sysdep.h

@@ -171,7 +171,7 @@
 
 # elif defined _LIBC_REENTRANT
 
-#  if USE___THREAD
+#  if defined USE___THREAD
 
 #   ifndef NOT_IN_libc
 #    define SYSCALL_ERROR_ERRNO __libc_errno

libc/sysdeps/linux/xtensa/sysdep.h

@@ -114,7 +114,7 @@
 
 #define ret_ERRVAL retw
 
-#if RTLD_PRIVATE_ERRNO
+#if defined RTLD_PRIVATE_ERRNO
 # define SYSCALL_ERROR_HANDLER						      \
 0:	movi	a4, rtld_errno;						      \
 	neg	a2, a2;							      \
@@ -124,7 +124,7 @@
 
 #elif defined _LIBC_REENTRANT
 
-# if USE___THREAD
+# if defined USE___THREAD
 #  ifndef NOT_IN_libc
 #   define SYSCALL_ERROR_ERRNO __libc_errno
 #  else