Remove old msc ver. Freecad 0.20 require 64 bit and windows 7 or higher. For this reason, msc libraries less than 1800 will no longer be used. (#7036)

* remove msc<1800

src/Mod/Drawing/Gui/TaskOrthoViews.cpp

@@ -51,12 +51,7 @@ namespace bp = boost::placeholders;
 #endif
 
 
-#if _MSC_VER <= 1700
-// maybe in the c++ standard later, older compiler don't have round()
-double round(double r) {
-    return (r > 0.0) ? floor(r + 0.5) : ceil(r - 0.5);
-}
-#endif  // _MSC_VER < 1500
+
 
 void pagesize(string & page_template, int dims[4], int block[4])
 {

src/Mod/Fem/App/FemConstraint.cpp

@@ -70,12 +70,7 @@
 
 using namespace Fem;
 
-// maybe in the c++ standard later, older compiler don't have round()
-#if _MSC_VER <= 1700
-double round(double r) {
-    return (r > 0.0) ? floor(r + 0.5) : ceil(r - 0.5);
-}
-#endif
+
 
 #if OCC_VERSION_HEX >= 0x070600
 using Adaptor3d_HSurface = Adaptor3d_Surface;

src/Mod/Mesh/App/WildMagic4/Wm4Platforms.h

@@ -60,15 +60,8 @@ typedef long long Integer64;
 
 #if defined(_MSC_VER)
 
-// Microsoft Visual C++ specific pragmas.  MSVC6 is version 12.00, MSVC7.0 is
-// version 13.00, and MSVC7.1 is version 13.10.  MSVC8.0 is version 14.00.
-#if _MSC_VER < 1300
-#define WM4_USING_VC6
-#elif _MSC_VER < 1310
-#define WM4_USING_VC70
-#elif _MSC_VER < 1400
-#define WM4_USING_VC71
-#else
+// Microsoft Visual C++ specific pragmas.
+#if _MSC_VER
 #define WM4_USING_VC80
 #endif