main/gcc: unbreak libgcc on uclibc, update musl patches

- refresh all musl patches (gcc_cv_libc_provides_ssp detects now)
- add patch to fix the musl patch so that on uclibc we also use
  gcc_cv_target_dl_iterate_phdr since the sources was changed to
  use this instead of __GLIBC__ defines
main/nodejs: upgrade to 0.10.19
main/gmp5: fix crosscompling properly

hack libtool to properly set -L and rpath when sysroot building.
main/apk-tools: fix crossbuild makedepends
main/gcc: fix crossbuild failure
main/mysql: upgrade to 5.5.34
main/asterisk: cherry-pick fix for ASTERISK-21859

Picked from 11-stable branch, and is already in 11.6.0-rc1.
But I need it early for testing.
main/file: upgrade to 5.15
main/glade: upgrade to 3.16.0
main/pingu: upgrade to 1.4
main/qt: upgrade to 4.8.5

many bug fixes. rebase the theme patch too.
main/isl: fix download url
main/mpfr3: fix download url
main/mpfr3: upgrade to 3.1.2
main/dovecot: upgrade to 2.2.6
main/openrc: fix an off-by-one bug
main/phpmyadmin: upgrade to 4.0.7
main/musl: add workaround for gcc bug 58245
main/linux-headers: support armhf
main/vlc: upgrade to 2.1.0