Update nra_plugin.c (#528) #505

Job	Run time
ubuntu-latest\|debug\|--enable-mcsat\|CC=gcc CXX=g++	8m 52s
ubuntu-latest\|debug\|--enable-mcsat\|CC=clang CXX=clang++	9m 38s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=gcc CXX=g++	4m 22s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=clang CXX=clang++	4m 47s
ubuntu-latest\|release\|--enable-mcsat\|CC=gcc CXX=g++	6m 6s
ubuntu-latest\|release\|--enable-mcsat\|CC=clang CXX=clang++	6m 4s
ubuntu-latest\|release\|--enable-thread-safety\|CC=gcc CXX=g++	2m 47s
ubuntu-latest\|release\|--enable-thread-safety\|CC=clang CXX=clang++	3m 23s
ubuntu-latest\|gcov\|--enable-mcsat\|CC=gcc CXX=g++	8m 23s
ubuntu-latest\|debug\|--enable-thread-safety --enable-mcsat\|CC=gcc CXX=g++	8m 43s
	1h 3m 5s

Provide feedback