Use system wide check instead of our own version

There is no reason why we should have our own version of check bundled
in. We can use system wide version instead.

.DockerFile

@@ -8,7 +8,7 @@ RUN \
   apt-get -y install --no-install-recommends \
     busybox ca-certificates curl git \
     make pkg-config gcc cmake \
-    cppcheck valgrind \
+    check cppcheck valgrind \
     libcurl4-openssl-dev libevent-dev \
     lua5.1 liblua5.1-0-dev \
     asciidoc lcov markdown libcommon-sense-perl \

.gitmodules

 [submodule "build"]
 	path = build
 	url = https://gitlab.labs.nic.cz/turris/buildsystem.git
-[submodule "tests/check"]
-	path = tests/check
-	url = https://github.com/libcheck/check.git
 [submodule "tests/lunit-launch/lunit"]
 	path = tests/lunit-launch/lunit
 	url = http://repo.or.cz/lunit.git

tests/Makefile.dir

@@ -5,19 +5,12 @@ BINARIES_NOTARGET += tests/locks
 locks_MODULES += locks
 locks_LOCAL_LIBS += updater
 
-$(O)/tests/check-compiled/compiled:
-	mkdir -p $(O)/tests/check-compiled
-	cd $(O)/tests/check-compiled && cmake $(abspath $(S))/tests/check -DHAVE_SUBUNIT=0
-	+make -C $(O)/tests/check-compiled
-	touch $(O)/tests/check-compiled/compiled
-
 $(O)/tests/luacheck-compiled/bin/luacheck:
 	mkdir -p $(O)/tests/luacheck-compiled
 	cd $(S)/tests/luacheck && ./install.lua $(abspath $(O)/tests/luacheck-compiled)
 
 clean: check-clean
 check-clean:
-	rm -rf $(O)/tests/check-compiled
 	rm -rf $(O)/tests/luacheck-compiled
 
 C_TESTS := \
@@ -72,12 +65,9 @@ define DO_C_TEST
 
 BINARIES_NOTARGET += tests/ctest-$(1)
 ctest-$(1)_MODULES += $(1) uriinternal.embed ctest
-$$(patsubst %,$(O)/.objs/tests/%.o,$$(ctest-$(1)_MODULES)): $(O)/tests/check-compiled/compiled
-ctest-$(1)_SYSTEM_LIBS += check m rt
+ctest-$(1)_SYSTEM_LIBS += m rt
+ctest-$(1)_PKG_CONFIGS += check
 ctest-$(1)_LOCAL_LIBS += updater
-$(O)/bin/ctest-$(1): EXTRA_LIBDIRS := $(O)/tests/check-compiled/src/
-$(O)/bin/ctest-$(1): EXTRA_INCLUDES := $(O)/tests/check-compiled/src $(S)/tests/check/src/ $(S)/tests/check-compiled/
-$(O)/bin/ctest-$(1): $(O)/tests/check-compiled/compiled
 
 test: test-c-$(1)
 valgrind: valgrind-c-$(1)

check @ db24aacf

-Subproject commit db24aacf1fdb41371aef16f6d8c2bb68b890f529