scripts/Programming/Tcl/build: compile with system compiler

scripts/Programming/Tcl/build

@@ -21,7 +21,9 @@ function em.post_install() {
 	{ cd "${PREFIX}"/bin && rm -f tclsh && ln -fs tclsh${V%.*} tclsh; };
 }
 
+# use system's cc
+declare CC=cc
+
 em.add_to_family 'Programming'
 em.set_docfiles 'license.terms' 'README'
-em.set_build_dependencies "${COMPILER}"
 em.make_all