Fixed generation of Carbon resources for AU plug-ins (was broken by commit fad8d052).

extras/Projucer/Source/Utility/jucer_FileHelpers.h

@@ -61,7 +61,7 @@ const char* const cppFileExtensions             = "cpp;cc;cxx";
 const char* const objCFileExtensions            = "mm;m";
 const char* const asmFileExtensions             = "s;S;asm";
 const char* const sourceOrHeaderFileExtensions  = "cpp;mm;m;c;cc;cxx;swift;s;S;asm;h;hpp;hxx;hh;inl";
-const char* const browseableFileExtensions      = "cpp;mm;m;c;cc;cxx;swift;s;S;asm;h;hpp;hxx;hh;inl;txt;md;rtf";
+const char* const browseableFileExtensions      = "cpp;mm;m;c;cc;cxx;swift;s;S;asm;r;h;hpp;hxx;hh;inl;txt;md;rtf";
 const char* const fileTypesToCompileByDefault   = "cpp;mm;c;m;cc;cxx;swift;s;S;asm;r";
 
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