checkapk: cannot diff names with regex characters in them

notably:

>>> Size difference for libstdc++: 2356 KiB -> 

this is because of the awk match:

awk "/^$pkg/ { found = 1 } /^[0-9]+/ { if (found) { print \$0; exit } }"

where the $pkg is the pkgname and so it has a ++ in it and then fails to match. the name would have to be escaped to work here