We now first run the perl command to get the compiler flags and display
those when compiling modperl, so we now what's going on.
Plus this also uses -Wno-write-strings to disabled all the perl compiler
warnings.
git-svn-id: https://znc.svn.sourceforge.net/svnroot/znc/trunk@1261 726aef4b-f618-498e-8847-2d620e286838