Makefile: Added the -D_GLIBCXX_DEBUG flag again to get checked stl during debug

Makefile

@@ -4,7 +4,7 @@
 HAVE_RULES = yes
 
 ifndef CXXFLAGS
-    CXXFLAGS=-Wall -Wextra -Wshadow -pedantic -Wno-long-long -Wfloat-equal -Wcast-qual -g
+    CXXFLAGS=-Wall -Wextra -Wshadow -pedantic -Wno-long-long -Wfloat-equal -Wcast-qual -D_GLIBCXX_DEBUG -g
 endif
 
 ifeq ($(HAVE_RULES),yes)

tools/dmake.cpp

@@ -244,6 +244,7 @@ int main(int argc, char **argv)
                                 "-Wcast-qual "
 //                                "-Wsign-conversion "
 //                                "-Wconversion "
+                                "-D_GLIBCXX_DEBUG "
                                 "-g");
     }