Drop Borland compiler specific code

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>
(cherry picked from commit 3989b447c3)

kpdf/xpdf/xpdf/xpdf_config.h

@@ -84,7 +84,7 @@
 // popen
 //------------------------------------------------------------------------
 
-#if defined(_MSC_VER) || defined(__BORLANDC__)
+#if defined(_MSC_VER)
 #define popen _popen
 #define pclose _pclose
 #endif
@@ -103,7 +103,7 @@
 #undef CDECL
 #endif
 
-#if defined(_MSC_VER) || defined(__BORLANDC__)
+#if defined(_MSC_VER)
 #define CDECL __cdecl
 #else
 #define CDECL