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Removing redundent header checks

--- a/configure

+++ b/configure

@@ -2494,7 +2494,7 @@

 done

-for ac_header in getopt.h fcntl.h limits.h malloc.h unistd.h byteswap.h sys/types.h inttypes.h stdint.h string.h errno.h

+for ac_header in getopt.h fcntl.h limits.h malloc.h unistd.h byteswap.h errno.h

 do

 as_ac_Header=`echo "ac_cv_header_$ac_header" | $as_tr_sh`

 if eval "test \"\${$as_ac_Header+set}\" = set"; then

--- a/configure.in

+++ b/configure.in

@@ -69,7 +69,7 @@

 dnl Checks for header files.

 AC_HEADER_STDC

-AC_CHECK_HEADERS(getopt.h fcntl.h limits.h malloc.h unistd.h byteswap.h sys/types.h inttypes.h stdint.h string.h errno.h)

+AC_CHECK_HEADERS(getopt.h fcntl.h limits.h malloc.h unistd.h byteswap.h errno.h)

 dnl Extra CFLAGS if we have gcc

 if test "$GCC" = yes