Correctly report native-lib filenames when still packed in APK files

[lemnik]

Goal

Ensure that .so files are reported by name (where possible) when the native libraries are not extracted from the .apk file. When packaged correctly, the operating system may load the .so files from within the .apk file in order to save space and time (see extractNativeLibs and useLegacyPackaging for more information).

Symbols for these files were sometimes being reported as coming from base.apk instead of the expected .so file, and as a result were not displaying the correct symbols on the Dashboard.

Changes

Updated the dladdr fallback logic in the stack unwinder to look for filenames ending in .apk. If these are found, the filename is either resolved from the Elf.soname (in the case of handled errors) or dladdr (in the case of signals).

Testing

The test fixtures now use extractNativeLibs=false which previously would cause them to fail when the symbols could not be read. The symbolicate function used by Mazerunner now looks for the ! indicator in filenames, and retrieves the correct filename when symbolicating native stack traces for tests.

Notes

dladdr on Android 6 reports base.apk as the filename if the library has not been unpacked, so one of our existing scenarios (Causing a crash in a separate library / CXXExternalStackElementScenario) cannot correctly report its filename. This scenario is now skipped on Android 6.

[bugsnagbot]

Android notifier sizes

Format	Size impact of Bugsnag (kB)	Size impact of Bugsnag when Minified (kB)
APK	1868.07	1615.76
arm64_v8a	655.76	405.9
armeabi_v7a	590.23	340.37
x86	729.47	479.61
x86_64	700.8	450.95

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