Makefile: completly rewrite

This change is a complete rewrite of fscrypt's Makefile.

The new build rules can be roughly divided into secions:
  Build   - bin/fscrypt and bin/pam_fscrypt
  Linting - gen (for .proto files), format, lint
  Test    - test, test-{setup|teardown}, coverage.out
  Install - install, uninstall, install-{bin|pam}
  Tools   - tools and other bin/* needed for the other rules

As before, "make" builds the binary and pam_module, while "make all"
builds and tests everything (except for integration tests), and "make
clean" removes any generated files.

Also note that this new build system:
  - Doesn't require input_fail.py
  - Properly falis on linter errors
  - Builds everything into the bin/ directory (customizable)
  - Builds all the vendored tools

1 files changed, 9 insertions, 3 deletions

diff --git a/.gitignore b/.gitignore
index 09289e3..f6293d5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,10 @@
-fscrypt
-fscrypt_image
-pam_fscrypt.so
+bin/fscrypt
+bin/pam_fscrypt.so
+bin/protoc
+bin/golint
+bin/protoc-gen-go
+bin/goimports
+bin/megacheck
+bin/gocovmerge
+*coverage.out
 .vscode