tests/llvm: Allow test to run with static-only llvm

Like on windows, where shared llvm isn't support.

test cases/frameworks/15 llvm/meson.build

@@ -1,19 +1,30 @@
 project('llvmtest', ['c', 'cpp'], default_options : ['c_std=c99'])
 
 d = dependency('llvm', required : false)
+if not d.found()
+  d = dependency('llvm', required : false, static : true)
   if not d.found()
     error('MESON_SKIP_TEST llvm not found.')
+  else
+    static = true
+  endif
+else
+  static = false
 endif
 
-d = dependency('llvm', modules : 'not-found', required : false)
+d = dependency('llvm', modules : 'not-found', required : false, static : static)
 assert(d.found() == false, 'not-found llvm module found')
 
-d = dependency('llvm', version : '<0.1', required : false)
+d = dependency('llvm', version : '<0.1', required : false, static : static)
 assert(d.found() == false, 'ancient llvm module found')
 
-d = dependency('llvm', optional_modules : 'not-found', required : false)
+d = dependency('llvm', optional_modules : 'not-found', required : false, static : static)
 assert(d.found() == true, 'optional module stopped llvm from being found.')
 
+# Check we can apply a version constraint
+d = dependency('llvm', version : ['< 500', '>=@0@'.format(d.version())], required: false, static : static)
+assert(d.found() == true, 'Cannot set version constraints')
+
 dep_tinfo = dependency('tinfo', required : false)
 if not dep_tinfo.found()
   cpp = meson.get_compiler('cpp')
@@ -35,12 +46,10 @@ foreach static : [true, false]
       'sum.c',
       dependencies : [
         llvm_dep, dep_tinfo,
-        dependency('zlib'),
+        # zlib will be statically linked on windows
+        dependency('zlib', required : host_machine.system() != 'windows'),
         meson.get_compiler('c').find_library('dl', required : false),
       ]
     )
   endif
 endforeach
-
-# Check we can apply a version constraint
-dependency('llvm', version: '>=@0@'.format(d.version()))