Keep the same stub lib naming convention as in the other Tcl ports.
Set here to propagate through everything.

Index: unix/configure
--- unix/configure.orig
+++ unix/configure
@@ -11288,11 +11288,11 @@ fi
 # Replace ${VERSION} with contents of ${TCL_VERSION}
 # double-eval to account for TCL_TRIM_DOTS.
 #
-eval "TCL_STUB_LIB_FILE=libtclstub.a"
+eval "TCL_STUB_LIB_FILE=libtclstub90.a"
 eval "TCL_STUB_LIB_FILE=\"${TCL_STUB_LIB_FILE}\""
 eval "TCL_STUB_LIB_DIR=\"${libdir}\""
 
-TCL_STUB_LIB_FLAG="-ltclstub"
+TCL_STUB_LIB_FLAG="-ltclstub90"
 
 TCL_BUILD_STUB_LIB_SPEC="-L`pwd | sed -e 's/ /\\\\ /g'` ${TCL_STUB_LIB_FLAG}"
 TCL_STUB_LIB_SPEC="-L${TCL_STUB_LIB_DIR} ${TCL_STUB_LIB_FLAG}"
