Replace wine function check for Z:\usr\ folder check

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

source/backend/plugin/CarlaPluginJuce.cpp

@@ -50,10 +50,6 @@
 
 #include "JucePluginWindow.hpp"
 
-namespace juce {
-extern bool juce_isRunningInWine();
-}
-
 CARLA_BACKEND_START_NAMESPACE
 
 // -------------------------------------------------------------------------------------------------------------------
@@ -1304,7 +1300,7 @@ public:
 
 #ifdef CARLA_OS_WIN
             // Fix for wine usage
-            if (juce::juce_isRunningInWine() && filename[0] == '/')
+            if (juce::File("Z:\\usr\\").existsAsFolder() && filename[0] == '/')
             {
                 jfilename.replace("/", "\\");
                 jfilename = "Z:" + jfilename;

source/discovery/carla-discovery.cpp

@@ -1336,10 +1336,6 @@ static void do_vst_check(lib_t& libHandle, const char* const filename, const boo
 #endif // ! USE_JUCE_PROCESSORS
 
 #ifdef USE_JUCE_PROCESSORS
-namespace juce {
-extern bool juce_isRunningInWine();
-}
-
 static void do_juce_check(const char* const filename_, const char* const stype, const bool doInit)
 {
     CARLA_SAFE_ASSERT_RETURN(stype != nullptr && stype[0] != 0,) // FIXME
@@ -1349,7 +1345,7 @@ static void do_juce_check(const char* const filename_, const char* const stype,
 
 #ifdef CARLA_OS_WIN
     // Fix for wine usage
-    if (juce::juce_isRunningInWine() && filename_[0] == '/')
+    if (juce::File("Z:\\usr\\").existsAsFolder() && filename_[0] == '/')
     {
         filename = filename_;
         filename.replace("/", "\\");