Remove unused getSelfLocation (#581)

At the very early days of the mac port, we thought we needed
getSelfLocation in SurgeStorage, but then realized we didn't
so took out that code path. But we didn't take out the implementation.
Do so.

src/common/SurgeStorage.cpp

@@ -43,24 +43,6 @@ double dsamplerate_os, dsamplerate_os_inv;
 
 using namespace std;
 
-#if MAC
-#include <CoreFoundation/CoreFoundation.h>
-string getSelfLocation()
-{
-   char path[PATH_MAX];
-   // TODO: use a build-provided symbol
-   CFStringRef selfName = CFSTR("com.vemberaudio.plugins.surge");
-   CFBundleRef mainBundle = CFBundleGetBundleWithIdentifier(selfName);
-   CFURLRef resourcesURL = CFBundleCopyBundleURL(mainBundle);
-   CFStringRef str = CFURLCopyFileSystemPath(resourcesURL, kCFURLPOSIXPathStyle);
-   CFRelease(resourcesURL);
-   CFStringGetCString(str, path, FILENAME_MAX, kCFStringEncodingASCII);
-   CFRelease(str);
-   string out(path);
-   return out;
-}
-#endif
-
 SurgeStorage::SurgeStorage()
 {
    _patch.reset(new SurgePatch(this));