Bug#887757: heaptrack FTBFS with glibc 2.26

[Adrian Bunk]

Source: heaptrack
Version: 1.0.1~20170503.git4da8c45-3
Severity: serious

https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/heaptrack.html

...
/build/1st/heaptrack-1.0.1~20170503.git4da8c45/tests/manual/test.cpp: In function 'int main()':
/build/1st/heaptrack-1.0.1~20170503.git4da8c45/tests/manual/test.cpp:85:5: error: 'cfree' was not declared in this scope
     cfree(buf);
     ^~~~~