Makefile: do not hard code g++ version. On ancient systems left up to user to set it properly...

Makefile

@@ -4,8 +4,7 @@ CXXFLAGS=-std=c++17 -O0 -g -no-pie -pipe -MMD -Wall -Wextra
 RELEASE_CXXFLAGS=-std=c++17 -O3 -pipe -MMD -Wall -Wextra
 LDFLAGS=-lsqlite3 -lpthread -lcrypto -lboost_regex -lstdc++fs
 
-#currently default g++ versions in most distros do not usually support c++17 well enough
-CXX=g++-8.2.0
+CXX=g++
 
 
 SOURCES=$(wildcard *.cpp)