Get rid of the pre-check for the font file path

It failed early in case there are no such file in local file system,
even if the String specified vaild resource available by other means.
Suggested by Richard Cohn.

Autoported commit.
Original commit hash: [279206fa1]

Author: yulian-gaponenko

itext/itext.io/itext/io/font/FontProgram.cs

@@ -288,6 +288,7 @@ protected internal virtual void SetFontName(String psFontName) {
             fontNames.SetFontName(psFontName);
         }
 
+        [Obsolete]
         protected internal virtual void CheckFilePath(String path) {
             if (path != null && !FontConstants.BUILTIN_FONTS_14.Contains(path) && !FileUtil.FileExists(path)) {
                 throw new iText.IO.IOException(iText.IO.IOException.FontFile1NotFound).SetMessageParams(path);

itext/itext.io/itext/io/font/TrueTypeFont.cs

@@ -79,7 +79,6 @@ protected internal TrueTypeFont() {
 
         /// <exception cref="System.IO.IOException"/>
         public TrueTypeFont(String path) {
-            CheckFilePath(path);
             fontParser = new OpenTypeParser(path);
             fontParser.LoadTables(true);
             InitializeFontProperties();
@@ -94,7 +93,6 @@ public TrueTypeFont(byte[] ttf) {
 
         /// <exception cref="System.IO.IOException"/>
         internal TrueTypeFont(String ttcPath, int ttcIndex) {
-            CheckFilePath(ttcPath);
             fontParser = new OpenTypeParser(ttcPath, ttcIndex);
             fontParser.LoadTables(true);
             InitializeFontProperties();

itext/itext.io/itext/io/font/Type1Font.cs

@@ -87,8 +87,6 @@ protected internal Type1Font() {
         /// <exception cref="System.IO.IOException"/>
         protected internal Type1Font(String metricsPath, String binaryPath, byte[] afm, byte[] pfb)
             : this() {
-            CheckFilePath(metricsPath);
-            CheckFilePath(binaryPath);
             fontParser = new Type1Parser(metricsPath, binaryPath, afm, pfb);
             Process();
         }

port-hash

@@ -1 +1 @@
-ee59fd1829db16ee00c53ec4ec74caceba6643b4
+279206fa18dd49a50a5d93060de59c61697e51ce