Fix warnings on Windows build

Signed-off-by: falkTX <falktx@gmail.com>

source/modules/juce_graphics/image_formats/jpglib/jdphuff.c

@@ -467,7 +467,7 @@ decode_mcu_AC_refine (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
   phuff_entropy_ptr2 entropy = (phuff_entropy_ptr2) cinfo->entropy;
   int Se = cinfo->Se;
   int p1 = 1 << cinfo->Al;	/* 1 in the bit position being coded */
-  int m1 = (-1) << cinfo->Al;	/* -1 in the bit position being coded */
+  int m1 = (unsigned int)(-1) << cinfo->Al;	/* -1 in the bit position being coded */
   int s, k, r;
   unsigned int EOBRUN;
   JBLOCKROW block;

source/modules/juce_graphics/image_formats/juce_JPEGLoader.cpp

@@ -46,6 +46,9 @@ namespace jpeglibNamespace
     #if __has_warning("-Wcomma")
      #pragma clang diagnostic ignored "-Wcomma"
     #endif
+   #elif defined(__GNUC__) && (__GNUC__ >= 7)
+    #pragma GCC diagnostic push
+    #pragma GCC diagnostic ignored "-Wimplicit-fallthrough"
    #endif
 
     #define JPEG_INTERNALS
@@ -123,6 +126,8 @@ namespace jpeglibNamespace
 
    #if JUCE_CLANG
     #pragma clang diagnostic pop
+   #elif defined(__GNUC__) && (__GNUC__ >= 7)
+    #pragma GCC diagnostic pop
    #endif
 #else
     #define JPEG_INTERNALS

source/modules/juce_graphics/image_formats/juce_PNGLoader.cpp

@@ -69,6 +69,9 @@ namespace pnglibNamespace
    #if __has_warning("-Wcomma")
     #pragma clang diagnostic ignored "-Wcomma"
    #endif
+  #elif defined(__GNUC__) && (__GNUC__ >= 7)
+   #pragma GCC diagnostic push
+   #pragma GCC diagnostic ignored "-Wimplicit-fallthrough"
   #endif
 
   #undef check
@@ -290,7 +293,10 @@ namespace pnglibNamespace
 
   #if JUCE_CLANG
    #pragma clang diagnostic pop
+  #elif defined(__GNUC__) && (__GNUC__ >= 7)
+   #pragma GCC diagnostic pop
   #endif
+
 #else
   extern "C"
   {

source/modules/juce_gui_basics/native/juce_win32_Windowing.cpp

@@ -2282,6 +2282,8 @@ private:
                     return MouseInputSource::InputSourceType::pen;
             }
         }
+#else
+        ignoreUnused(wParam);
 #endif
 
         return MouseInputSource::InputSourceType::mouse;

source/modules/juce_gui_basics/windows/juce_ComponentPeer.h

@@ -313,7 +313,7 @@ public:
 
     //==============================================================================
     void handleMouseEvent (MouseInputSource::InputSourceType type, Point<float> positionWithinPeer, ModifierKeys newMods, float pressure,
-                           float orientation, int64 time, PenDetails pen = {}, int touchIndex = 0);
+                           float orientation, int64 time, PenDetails pen = { 0.0f, 0.0f, 0.0f }, int touchIndex = 0);
 
     void handleMouseWheel (MouseInputSource::InputSourceType type, Point<float> positionWithinPeer,
                            int64 time, const MouseWheelDetails&, int touchIndex = 0);