remove asm/bitops.h, as its causing more problems then it fixes.

src/backend/port/linux/asm/bitops.h

-/* This is a hack that lets us use the -Wmissing-prototypes compile option.
-
-   A bug or weakness in Linux's asm/bitops.h file makes it define a bunch
-   of inline functions without first declaring a prototype.  This causes
-   -Wmissing-prototypes to generate warnings.  These warnings are distracting
-   and, in the case of -Werror, fatal.
-
-   asm/bitops.h gets included by the Linux C library sem.h, which is included
-   in several Postgres backend source files.
-
-   Until Linux is fixed, we have our own version of asm/bitops.h that gets
-   included first because it is in a directory mentioned in a -I option,
-   whereas the Linux asm/bitops.h is in a standard include directory.  (This
-   is GNU C preprocessor function).
-
-   Our asm/bitops.h declares prototypes and then includes the Linux 
-   asm/bitops.h.  If Linux changes these functions, our asm/bitops.h will
-   stop compiling and will have to be updated.
-
-   -Bryan 1996.11.17
-*/
-
-#ifndef POSTGRES_BITOPS_H
-#define POSTGRES_BITOPS_H
-
-#ifdef __SMP__
-#define PG_BITOPS_VOLATILE volatile
-#else
-#define PG_BITOPS_VOLATILE 
-#endif
-
-extern __inline__ int set_bit(int nr, PG_BITOPS_VOLATILE void * addr);
-extern __inline__ int clear_bit(int nr, PG_BITOPS_VOLATILE void * addr);
-extern __inline__ int change_bit(int nr, PG_BITOPS_VOLATILE void * addr);
-extern __inline__ int test_bit(int nr, const PG_BITOPS_VOLATILE void * addr);
-extern __inline__ int find_first_zero_bit(void * addr, unsigned size);
-extern __inline__ int find_next_zero_bit (void * addr, int size, int offset);
-extern __inline__ unsigned long ffz(unsigned long word);
-
-#include_next <asm/bitops.h>
-#endif