Updated windows freetype and xpdf build instruction

thirdparty/freetype/README.txt

@@ -6,6 +6,10 @@ instructions
 - Download freetype (http://www.freetype.org/download.html#stable)
 - Decompress freetype.XXX.tar.gz
 
+WIN
+  - qmake
+  - nmake
+
 MAC
   - qmake freetype.pro -spec macx-g++
   - make

thirdparty/xpdf/README.txt

@@ -7,9 +7,10 @@ instructions for version 3.02
 - Decompress xpdf-3.02.xx.tar.gz
 
 Windows:
-	- using cywin run ./configure
+	- copy xpdf-3.02/aconf-win32.h into xpdf-3.02/aconf.h
-	- run qmake xpdf.pro -r -spec win32-g++
+	- edit xpdf-3.02/aconf.h, add this line "#undef UNICODE"
-	- run make
+	- qmake
+	- nmake
 
 OSX:
     - cd xpdf-3.02

thirdparty/xpdf/xpdf-3.02/goo/GString.cc

@@ -528,7 +528,7 @@ void GString::formatDouble(double x, char *buf, int bufSize, int prec,
   if ((neg = x < 0)) {
     x = -x;
   }
-  x = floor(x * pow(10, prec) + 0.5);
+  x = floor(x * pow(10.0, prec) + 0.5);
   i = bufSize;
   started = !trim;
   for (j = 0; j < prec && i > 1; ++j) {