Fix remaining compiler warnings of (STR 3529)

src/Fl_File_Chooser2.cxx
src/Fl_File_Icon2.cxx
src/Fl_Help_View.cxx

The only known warnings are now in src/Fl_x.cxx as mentioned in
comment #1.

src/Fl_File_Chooser2.cxx

@@ -624,7 +624,7 @@ void
 Fl_File_Chooser::fileListCB()
 {
   char	*filename,			// New filename
-	pathname[FL_PATH_MAX];			// Full pathname to file
+	pathname[FL_PATH_MAX + 4];	// Full pathname to file
 
 
   filename = (char *)fileList->text(fileList->value());
@@ -809,7 +809,7 @@ Fl_File_Chooser::fileNameCB()
       directory(pathname);
 
       if (filename[0]) {
-	char tempname[FL_PATH_MAX];
+	char tempname[FL_PATH_MAX + 4];
 
 	snprintf(tempname, sizeof(tempname), "%s/%s", directory_, filename);
 	fileName->value(tempname);
@@ -968,7 +968,7 @@ void
 Fl_File_Chooser::newdir()
 {
   const char	*dir;				// New directory name
-  char		pathname[FL_PATH_MAX];	// Full path of directory
+  char		pathname[FL_PATH_MAX + 4];	// Full path of directory
 
 
   // Get a directory name from the user
@@ -1380,7 +1380,7 @@ Fl_File_Chooser::value(int f)	// I - File number
   int		i;		// Looping var
   int		fcount;		// Number of selected files
   const char	*name;		// Current filename
-  static char	pathname[FL_PATH_MAX];	// Filename + directory
+  static char	pathname[FL_PATH_MAX + 4]; // Filename + directory
 
 
   name = fileName->value();

src/Fl_File_Icon2.cxx

@@ -6,7 +6,7 @@
 // KDE icon code donated by Maarten De Boer.
 //
 // Copyright 1999-2010 by Michael Sweet.
-// Copyright 2011-2017 by Bill Spitzak and others.
+// Copyright 2011-2019 by Bill Spitzak and others.
 //
 // This library is free software. Distribution and use rights are outlined in
 // the file "COPYING" which should have been included with this file.  If this
@@ -574,7 +574,7 @@ void
 Fl_File_Icon::load_system_icons(void) {
   int		i;				// Looping var
   Fl_File_Icon	*icon;				// New icons
-  char		filename[FL_PATH_MAX];	// Filename
+  char		filename[FL_PATH_MAX + 60];	// Filename
   char		icondir[FL_PATH_MAX];		// Icon directory
   static int	init = 0;	// Have the icons been initialized?
   const char * const icondirs[] = {
@@ -819,7 +819,7 @@ load_kde_mimelnk(const char *filename,	// I - mimelnk filename
   char		pattern[1024];
   char		mimetype[1024];
   char		*val;
-  char		full_iconfilename[FL_PATH_MAX];
+  char		full_iconfilename[2 * FL_PATH_MAX];
   Fl_File_Icon	*icon;
 
 

src/Fl_Help_View.cxx

@@ -7,7 +7,7 @@
 // Image support by Matthias Melcher, Copyright 2000-2009.
 //
 // Buffer management (HV_Edit_Buffer) and more by AlbrechtS and others.
-// Copyright 2011-2018 by Bill Spitzak and others.
+// Copyright 2011-2019 by Bill Spitzak and others.
 //
 // This library is free software. Distribution and use rights are outlined in
 // the file "COPYING" which should have been included with this file.  If this
@@ -2775,7 +2775,7 @@ Fl_Shared_Image *
 Fl_Help_View::get_image(const char *name, int W, int H) {
   const char	*localname;		// Local filename
   char		dir[FL_PATH_MAX];	// Current directory
-  char		temp[FL_PATH_MAX],	// Temporary filename
+  char		temp[2 * FL_PATH_MAX],	// Temporary filename
 		*tempptr;		// Pointer into temporary name
   Fl_Shared_Image *ip;			// Image pointer...
 
@@ -2872,7 +2872,7 @@ void Fl_Help_View::follow_link(Fl_Help_Link *linkp)
   if (strcmp(linkp->filename, filename_) != 0 && linkp->filename[0])
   {
     char	dir[FL_PATH_MAX];	// Current directory
-    char	temp[FL_PATH_MAX],	// Temporary filename
+    char	temp[2 * FL_PATH_MAX],	// Temporary filename
 	      *tempptr;	// Pointer into temporary filename
 
 
@@ -3305,7 +3305,7 @@ int Fl_Help_View::load(const char *f)
   char		*target;	// Target in file
   char		*slash;		// Directory separator
   const char	*localname;	// Local filename
-  char		error[1024];	// Error buffer
+  char		error[2 * FL_PATH_MAX];	// Error buffer
   char		newname[FL_PATH_MAX];	// New filename buffer
 
   // printf("load(%s)\n",f); fflush(stdout);