modified the compiler and link options so nothing can be tested for after
this check, as the c-ares lib might not have been built yet!

anywhere. We need to write a better ftps-server for test purposes and then
we can re-introduced FTPS tests.

warnings

usage.

in alphabetical order

will be properly built with configure --disable-manual even if the source
file is already present

 threaded name resolves.

for it. It saves one extra copy of the header.

I also added comments for several functions in formdata.c

 o minor --fail with authentication bugfix

we can pass on "odd" characters (newline, CR, tab) like this.

option instead (even though it appends the pid to the file name, making it
harder to figure out its name to parse it after a test has run).

Also made sure we only use valgrind for the actual test command command lines,
not when for example running curl to detect if there are any already running
servers are present etc.