Some more fixes for Cygwin32/64 in win32 GUI mode. 
Now that this is fully working, eliminate all usage of WISH_BUILD_LIB_SPEC: TK_BUILD_LIB_SPEC can be used everywhere in stead. 
Add tk.pc
one more entry in ignore-glob
Some more fixes for Cygwin32/64 in win32 GUI mode. 
Now that this is fully working, eliminate all usage of WISH_BUILD_LIB_SPEC: TK_BUILD_LIB_SPEC can be used everywhere in stead. 
Remove some old carbon-leftovers from configure/make.