leek: if lseek syscall is not available, use lseek64 even for !LFS

With Busybox and uClibc - both built w/o LFS, this caused ash to be
completely broken, as lseek was simply returning error.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Cc: Markos Chandras <markos.chandras@imgtec.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

libc/sysdeps/linux/common/lseek.c

@@ -15,11 +15,20 @@
 # define __NR___lseek_nocancel __NR_lseek
 _syscall3(off_t, __NC(lseek), int, fd, off_t, offset, int, whence)
 /* Use lseek64 if __NR_lseek is not defined but UCLIBC_HAS_LFS is enabled */
-#elif !defined __NR_lseek && defined __NR_llseek \
-	&& __WORDSIZE == 32 && __UCLIBC_HAS_LFS__
+#elif !defined __NR_lseek && defined __NR_llseek
+#include <endian.h>
 off_t __NC(lseek)(int fd, off_t offset, int whence)
 {
+#if defined __UCLIBC_HAS_LFS__
 	return lseek64(fd, offset, whence);
+#elif __WORDSIZE == 32
+	__off64_t result;
+	__off_t high = 0;
+	return INLINE_SYSCALL(llseek, 5, fd,
+				__LONG_LONG_PAIR(high, offset),
+				&result, whence) ?: result;
+#endif
+/* No need to handle __WORDSIZE == 64 as such a kernel won't define __NR_llseek */
 }
 #else
 # include <errno.h>