treewide: remove empty default cases

There is no apparent reason to have an empty default case.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

tools/missing-macros/Makefile

@@ -8,7 +8,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=missing-macros
-PKG_RELEASE:=10
+PKG_RELEASE:=11
 
 include $(INCLUDE_DIR)/host-build.mk
 

tools/missing-macros/src/m4/mfx_limits.m4

@@ -147,8 +147,6 @@ case $host_os in
 cygwin* | mingw* | pw32*)
      test "X$LIBS" != "X" && LIBS="$LIBS "
      LIBS="${LIBS}-lwinmm" ;;
-*)
-     ;;
 esac
 fi
 ])#