updated build system

scripts/options.sh

@@ -1,6 +1,7 @@
 #!/bin/bash
 
 PROJECT_LIBRARIES=(
+  BACKWARD_CPP
   BOOST
   CPP_HTTPLIB
   CURL
@@ -17,6 +18,7 @@ PROJECT_LIBRARIES=(
 )
 
 declare -A PROJECT_CLEANUP
+PROJECT_CLEANUP[BACKWARD_CPP]="include/backward.hpp:src/backward.cpp"
 PROJECT_CLEANUP[BOOST]="boost_*"
 PROJECT_CLEANUP[CPP_HTTPLIB]="cpp-httplib-*"
 PROJECT_CLEANUP[CURL]="curl-*"