Merge branch 'misc-fixes' of https://github.com/MaartenBent/wxWidgets

Enable using PIC by default even for static libraries and several other
build-related fixes (warning fixes etc).

See https://github.com/wxWidgets/wxWidgets/pull/2008

demos/bombs/game.cpp

@@ -64,7 +64,7 @@ bool BombsGame::Init(int aWidth, int aHeight, bool easyCorner)
     {
         for(y=0; y<m_height; y++)
         {
-            m_field[x+y*m_width] = ((float)rand()/RAND_MAX <PROB)
+            m_field[x+y*m_width] = (rand()/(float)RAND_MAX <PROB)
                 ? BG_HIDDEN | BG_BOMB
                 : BG_HIDDEN;
         }