Identify machine in error accesing compiler object for missing language

Also add a failing test case for that error.

mesonbuild/interpreter.py

@@ -2093,7 +2093,7 @@ class MesonMain(InterpreterObject):
         clist = self.interpreter.coredata.compilers[for_machine]
         if cname in clist:
             return CompilerHolder(clist[cname], self.build.environment, self.interpreter.subproject)
-        raise InterpreterException('Tried to access compiler for unspecified language "%s".' % cname)
+        raise InterpreterException('Tried to access compiler for language "%s", not specified for %s machine.' % (cname, for_machine.get_lower_case_name()))
 
     @noPosargs
     @permittedKwargs({})

test cases/failing/109 compiler no lang/meson.build

@@ -0,0 +1,2 @@
+project('compiler without lang')
+meson.get_compiler('c')

test cases/failing/109 compiler no lang/test.json

@@ -0,0 +1,7 @@
+{
+  "stdout": [
+    {
+      "line": "test cases/failing/109 compiler no lang/meson.build:2:6: ERROR: Tried to access compiler for language \"c\", not specified for host machine."
+    }
+  ]
+}