Fix (ignore) some compiler warnings

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

dgl/src/NanoVG.cpp

@@ -89,7 +89,7 @@ DGL_EXT(PFNGLBLENDFUNCSEPARATEPROC,        glBlendFuncSeparate)
 static NVGcontext* nvgCreateGL_helper(int flags)
 {
 #if defined(DISTRHO_OS_WINDOWS)
-# if defined(__GNUC__) && (__GNUC__ >= 10)
+# if defined(__GNUC__) && (__GNUC__ >= 9)
 #  pragma GCC diagnostic push
 #  pragma GCC diagnostic ignored "-Wcast-function-type"
 # endif
@@ -127,7 +127,7 @@ DGL_EXT(PFNGLVERTEXATTRIBPOINTERPROC,      glVertexAttribPointer)
 DGL_EXT(PFNGLBLENDFUNCSEPARATEPROC,        glBlendFuncSeparate)
 # undef DGL_EXT
     needsInit = false;
-# if defined(__GNUC__) && (__GNUC__ >= 10)
+# if defined(__GNUC__) && (__GNUC__ >= 9)
 #  pragma GCC diagnostic pop
 # endif
 #endif

distrho/extra/LibraryUtils.hpp

@@ -20,6 +20,7 @@
 #include "../DistrhoUtils.hpp"
 
 #ifdef DISTRHO_OS_WINDOWS
+# include <winsock2.h>
 # include <windows.h>
 typedef HMODULE lib_t;
 #else
@@ -79,7 +80,14 @@ Func lib_symbol(const lib_t lib, const char* const symbol) noexcept
 
     try {
 #ifdef DISTRHO_OS_WINDOWS
+# if defined(__GNUC__) && (__GNUC__ >= 9)
+#  pragma GCC diagnostic push
+#  pragma GCC diagnostic ignored "-Wcast-function-type"
+# endif
         return (Func)::GetProcAddress(lib, symbol);
+# if defined(__GNUC__) && (__GNUC__ >= 9)
+#  pragma GCC diagnostic pop
+# endif
 #else
         return (Func)(uintptr_t)::dlsym(lib, symbol);
 #endif