stdint.m4: HAVE_SYS_INTTYPES_H set to "" breaks build

[Mike Frysinger]

building inetutils out of git fails with current gnulib:
$ make
...
make[4]: Entering directory `/usr/local/src/inetutils/lib'
  CC     gl_array_list.o
In file included from xsize.h:30,
                 from gl_array_list.c:28:
./stdint.h:84:7: error: #elif with no expression
./stdint.h:90:6: error: operator '&&' has no left operand
...

this is because m4/stdint.m4 only defines HAVE_SYS_INTTYPES_H when 
gl_cv_header_working_stdint_h is "no" and i my case, it's yes.  so it is 
assigned a default value of "" which causes the header to expand to:
#elif 

looks like similiar problem for HAVE_SYS_BITYPES_H

config.log attached
-mike

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