Multiple bugfixes and improvements after building gtk+ from scratch.

- Fix a bug in unzip-extraction.sh that skipped the package that
  requested unzip and instead used the origin template.
- Pass CFLAGS, CXXFLAGS and CPPFLAGS through the environment and unset
  them once the package has been installed.
- Do not show the dependencies required for a pkg more than once time.

--HG--
extra : convert_revision : 731135558d29787ab5178b80df3578420872709d

helper-templates/perl-module.sh

@@ -1,3 +1,4 @@
+#
 # This helper does the required steps to be able to build and install
 # perl modules into the correct location.
 #