fix gcc 5.4 warnings

Jan Willamowius

2019-04-22 51213b102296c1e48f25aa9472a8be74a31cb6b7

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# Compiled Object files
*.slo
*.lo
*.o
 
# Compiled Dynamic libraries
*.so
*.dylib
 
# Compiled Static libraries
*.lai
*.la
*.a
/Makefile
/Testing
 
# Cmake generated files
build