Handle clang 10 warnings:

+ fix -Wtautological-bitwise-compare
+ fix -Wimplicit-int-float-conversion
+ fix -Wmisleading-indentation
+ fix -Wrange-loop-construct
+ suppress -Wdeprecated-copy of 3rd party libs

src/zipios++/ziphead.cpp

@@ -198,7 +198,7 @@ bool ZipLocalEntry::trailingDataDescriptor() const {
   // gp_bitfield bit 3 is one, if this entry uses a trailing data
   // descriptor to keep size, compressed size and crc-32
   // fields.
-  if ( ( gp_bitfield & 4 ) == 1 )
+  if ( ( gp_bitfield & 4 ) == 4 )
     return true ;
   else
     return false ;