nasm: Harcode default path on Windows

NASM's installer does not add itself into PATH, even when installed by
choco.

mesonbuild/compilers/detect.py

@@ -1151,6 +1151,10 @@ def detect_nasm_compiler(env: 'Environment', for_machine: MachineChoice) -> Comp
 
     popen_exceptions: T.Dict[str, Exception] = {}
     for comp in compilers:
+        if comp == ['nasm'] and is_windows() and not shutil.which(comp[0]):
+            # nasm is not in PATH on Windows by default
+            default_path = os.path.join(os.environ['ProgramFiles'], 'NASM')
+            comp[0] = shutil.which(comp[0], path=default_path) or comp[0]
         try:
             output = Popen_safe(comp + ['--version'])[1]
         except OSError as e:

test cases/nasm/2 asm language/meson.build

@@ -1,18 +1,15 @@
 project('test', 'c')
 
-nasm = find_program('nasm', required: false)
-yasm = find_program('yasm', required: false)
-if not nasm.found() and not yasm.found()
-  assert(not add_languages('nasm', required: false))
-  error('MESON_SKIP_TEST: nasm not available')
-endif
-
 if not host_machine.cpu_family().startswith('x86')
   assert(not add_languages('nasm', required: false))
   error('MESON_SKIP_TEST: nasm only supported for x86 and x86_64')
 endif
 
-add_languages('nasm')
+if not add_languages('nasm', required: false)
+  nasm = find_program('nasm', 'yasm', required: false)
+  assert(not nasm.found())
+  error('MESON_SKIP_TEST: nasm not found')
+endif
 
 config_file = configure_file(
   output: 'config.asm',