Fix c++ compiler warnings

Fix c++ compiler warnings

An awk script was used to generate the changes. Hand editing was also
required:

function ltrim(s) { sub(/^[ \t\r\n]+/, "", s); return s }
function rtrim(s) { sub(/[ \t\r\n]+$/, "", s); return s }
function trim(s) { return rtrim(ltrim(s)); }

BEGIN {
}

/invalid conversion from ‘gpointer’/ {

split($0, file, ":");  # file-name line-number
split($0, fields, "[‘’]"); # get the typecast - these two characters are
UTF8 and are NOT the same

split(fields[6], cast, "*")

getline;

split($0, code, "[|=;]");

print "sed -i '" file[2]"s/"code[3]"/ static_cast<" cast[1] " *>("
trim(code[3]) ")/' " "./src/"file[1] ;