libpcap: fix build breakage with very high number of simultaneous jobs
Building libpcap with high number (64) of simultaneous jobs fails:
In file included from ./fmtutils.c:42:0:
./ftmacros.h:106:0: warning: "_BSD_SOURCE" redefined
#define _BSD_SOURCE
<command-line>:0:0: note: this is the location of the previous definition
./gencode.c:67:10: fatal error: grammar.h: No such file or directory
#include "grammar.h"
^~~~~~~~~~~
compilation terminated.
Makefile:99: recipe for target 'gencode_pic.o' failed
So fix this by less intrusive way by disabling the parallel builds for
this package.
Ref: FS#3010
Signed-off-by: Petr Štetiar <ynezz@true.cz>