Fix check-coverage target (CFLAGS+LDFLAGS not set properly)
Fix check-coverage target (CFLAGS+LDFLAGS not set properly)

Reported-by: https://github.com/darnir

dago/libpsl,dago/libpsl,darnir/libpsl,darnir/libpsl,darnir/libpsl,rockdaboot/libpsl,rockdaboot/libpsl,rockdaboot/libpsl,dago/libpsl