Dev:Updating extensions for iOS 9

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Compiling ldid on El Capitan
Not quite iOS 9, but still something to be aware of: El Capitan does not include OpenSSL, which ldid requires to compile. In order to get OpenSSL and modify ldid's make script to use it, follow these steps.

brew install openssl ./make.sh
 * Install Homebrew if you haven't already.
 * Install OpenSSL through Homebrew:
 * Clone ldid as normal.
 * Download this modded make.sh and replace the old one with this one.
 * Make as normal:

Compilation changes
Code must now be compiled with

-Wl,-segalign,4000

This LDFLAG can be used to compile for older iOS versions as it had to be a multiple of 1000.

If using Theos, add it like so:

XXX_LDFLAGS += -Wl,-segalign,4000

If using Xcode, add a new entry to Other linker flags containing "-Wl,-segalign,4000" to the build settings of your project or target.

Source: saurik's tweet

Entitlements
Some tweaks interacting with BackBoardServices now require an entitlement and will fail with the following error if it's not present on the binary:

Use ldid to sign your tweak with the following entitlement XML file:

Using ldid: ldid -Sentitlements.xml Tweak.dylib

Using theos, add this to your makefile: XXX_CODESIGN_FLAGS=-Sentitlements.xml

Which tools and other preexisting things are still working on iOS 9? Which ones don't work?

 * Cycript fails with the following error:

No fixes at the time of this writing.

Killed: 9
PanGu causes many command-line tools to not work, with the error "Killed: 9"

This can be solved by running "ldid -S `which `"