fix msvc compilation
fix msvc compilation

linsicai/or-tools,linsicai/or-tools,legrosbuffle/or-tools,WendellDuncan/or-tools,KapecK/or-tools,lfiaschi/or-tools,legrosbuffle/or-tools,google/or-tools,ThatRfernand/or-tools,pombredanne/or-tools,or-tools/or-tools,pombredanne/or-tools,ThatRfernand/or-tools,2947721120/or-tools,2947721120/or-tools,pombredanne/or-tools,WendellDuncan/or-tools,or-tools/or-tools,or-tools/or-tools,linsicai/or-tools,KapecK/or-tools,WendellDuncan/or-tools,ThatRfernand/or-tools,or-tools/or-tools,2947721120/curly-hockeypuck,pombredanne/or-tools,google/or-tools,lfiaschi/or-tools,ThatRfernand/or-tools,KapecK/or-tools,2947721120/or-tools,2947721120/or-tools,or-tools/or-tools,2947721120/curly-hockeypuck,ThatRfernand/or-tools,2947721120/curly-hockeypuck,or-tools/or-tools,legrosbuffle/or-tools,lfiaschi/or-tools,2947721120/or-tools,legrosbuffle/or-tools,WendellDuncan/or-tools,WendellDuncan/or-tools,KapecK/or-tools,lfiaschi/or-tools,google/or-tools,pombredanne/or-tools,2947721120/curly-hockeypuck,pombredanne/or-tools,2947721120/or-tools,KapecK/or-tools,2947721120/curly-hockeypuck,lfiaschi/or-tools,google/or-tools,linsicai/or-tools,linsicai/or-tools,google/or-tools,WendellDuncan/or-tools,lfiaschi/or-tools,google/or-tools,KapecK/or-tools,linsicai/or-tools,2947721120/curly-hockeypuck,legrosbuffle/or-tools