configure.ac: check egrep
The macro AC_HEADER_STDC which requires AC_PROG_EGREP has been removed from configure.ac, then it fails to substitute '@egrep@':
| [GEN] command-lines-input.h | /bin/bash: line 2: @egrep@: command not found | [GEN] command-count.h
Call AC_PROG_EGREP to fix the error.
Signed-off-by: Kai Kang kai.kang@windriver.com