libgcobol: Remove unused headers from shared sources.

This reduces the number of headers included in sources that are
shared with the Front End.

libgcobol/ChangeLog:

	* charmaps.cc: Remove unused headers
	* libgcobol.h: Likewise.
	* valconv.cc: Likewise.

Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>

libgcobol/charmaps.cc

@@ -30,16 +30,10 @@
  */
 
 #include <ctype.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <math.h>
 #include <stdio.h>
-#include <stdlib.h>
 #include <string.h>
 #include <time.h>
-#include <unistd.h>
 #include <algorithm>
-#include <langinfo.h>
 #include <unordered_map>
 #include <locale.h>
 #include <iconv.h>

libgcobol/libgcobol.h

@@ -33,7 +33,6 @@
 #include <stdio.h>
 
 #include <map>
-#include <unordered_map>
 #include <vector>
 
 #define MIN_FIELD_BLOCK_SIZE (16)

libgcobol/valconv.cc

@@ -30,31 +30,15 @@
  */
 
 #include <ctype.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <math.h>
-#include <fenv.h>
 #include <stdio.h>
-#include <stdlib.h>
 #include <string.h>
-#include <time.h>
-#include <unistd.h>
 #include <algorithm>
 #include <unordered_map>
-#include <set>
 
 #include "ec.h"
 #include "common-defs.h"
-#include "io.h"
-#include "gcobolio.h"
-#include "libgcobol.h"
-#include "gfileio.h"
 #include "charmaps.h"
 
-#include <sys/mman.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-
 #include "valconv.h"
 #include "exceptl.h"