unit tests: Remove all instances of FakeEnvironment

We don't need to use that, and it causes build failures when code
actually uses the environment.

run_tests.py

@@ -155,15 +155,6 @@ def run_configure(meson_command, commandlist):
         return run_configure_external(meson_exe + commandlist)
     return run_configure_inprocess(meson_command, commandlist)
 
-class FakeEnvironment(object):
-    def __init__(self):
-        self.cross_info = None
-        self.coredata = lambda: None
-        self.coredata.compilers = {}
-
-    def is_cross_build(self):
-        return False
-
 def print_system_info():
     print(mlog.bold('System information.').get_text(mlog.colorize_console))
     print('Architecture:', platform.architecture())

run_unittests.py

@@ -40,7 +40,7 @@ from mesonbuild.environment import Environment
 from mesonbuild.dependencies import DependencyException
 from mesonbuild.dependencies import PkgConfigDependency, ExternalProgram
 
-from run_tests import exe_suffix, get_fake_options, FakeEnvironment
+from run_tests import exe_suffix, get_fake_options
 from run_tests import get_builddir_target_args, get_backend_commands, Backend
 from run_tests import ensure_backend_detects_changes, run_configure, meson_exe
 from run_tests import should_run_linux_cross_tests
@@ -1555,7 +1555,8 @@ int main(int argc, char **argv) {
                                        '--libdir=' + libdir])
         # Find foo dependency
         os.environ['PKG_CONFIG_LIBDIR'] = self.privatedir
-        env = FakeEnvironment()
+        env = Environment(testdir, self.builddir, self.meson_command,
+                          get_fake_options(self.prefix), [])
         kwargs = {'required': True, 'silent': True}
         foo_dep = PkgConfigDependency('libfoo', env, kwargs)
         # Ensure link_args are properly quoted
@@ -1856,7 +1857,8 @@ class LinuxlikeTests(BasePlatformTests):
         '''
         testdir = os.path.join(self.common_test_dir, '51 pkgconfig-gen')
         self.init(testdir)
-        env = FakeEnvironment()
+        env = Environment(testdir, self.builddir, self.meson_command,
+                          get_fake_options(self.prefix), [])
         kwargs = {'required': True, 'silent': True}
         os.environ['PKG_CONFIG_LIBDIR'] = self.privatedir
         foo_dep = PkgConfigDependency('libfoo', env, kwargs)