Firefox requires new version of the icu to build:
```
checking for icu-i18n >= 58.1... Requested 'icu-i18n >= 58.1' but version of icu-i18n is 57.1
configure: error: Library requirements (icu-i18n >= 58.1) not met; consider adjusting the PKG_CONFIG_PATH environment variable if your libraries are in a nonstandard prefix so pkg-config can find them.
```
Only zoom-us depends on icu4c-54.1. Since we know that version has some vulnerabilities, and zoom-us appears to work with icu4c-57.1, I remove the icu/54.1.nix file, remove icu_54_1 from all-packages.nix, and have zoom-us depend on icu (i.e., icu4c-57.1)
This reverts commit d393c6c538.
The commit removed C++11 compatibility on darwin by overriding the
--std=c++0x flag in CXXFLAGS. Which lead to a failing build of mapnik,
which depends on the move constructors being available in the icu-lib.
Since it builds fine without the headerpad_max_install_names flag, we
simply undo the change that introduced this flag.
The most complex problems were from dealing with switches reverted in
the meantime (gcc5, gmp6, ncurses6).
It's likely that darwin is (still) broken nontrivially.
On darwin, not doing this means the configure script uses a hard-coded
/bin/sh for its echo tests, resulting in ECHO_N and ECHO_C settings in
icu-config which are incorrect for the stdenv.shell which it is actually
uses to run.
Install names need to be absolute paths, otherwise programs that link
against the dylib won't work without setting $DYLD_LIBRARY_PATH. Most
packages do this correctly, but some (like Boost and ICU) do not.
This setup hook absolutizes all install names.
This comes from:
svn diff ^/nixpkgs/trunk/@18255 ^/nixpkgs/branches/stdenv-updates/ > diff
patch -p0 < diff
and then adding into svn all files new from the patch.
trunk@18255 comes from the last time I updated stdenv-updates from trunk.
svn path=/nixpkgs/stdenv-updates2/; revision=18272
