Use ninja also in all other development PKGBUILDs.
Add development PKGBUILDs for GCC4.6/4.7.
Enable everything possible in development PKGBUILDs.
GCC 4.6 compatibility: no std::unordered_map::emplace().
GCC 4.6 compatibility: apparently can't list-initialize a structure.
Text: I was probably drunk or something.

This _is_ supported in GCC 4.6 and there is _nothing_ like
MAGNUM_GCC46_COMPATIBILITY since a long time.
Platform: make all constructors implicitly explicit.
Platform: this documentation block is superfluous.
Platform: deinline also these destructors.

Miight reduce some code bloat.
Platform: I was drunk also when writing this.

The comment contradicts the statement.
Platform: deinline also all ScreenedApplication {con,de}structors.