do not skip test case 113 on Windows

test cases/common/113 generatorcustom/meson.build

@@ -1,21 +1,18 @@
 project('generatorcustom', 'c')
 
-if meson.get_compiler('c').get_id() != 'msvc'
+creator = find_program('gen.py')
-  creator = find_program('gen.py')
+catter = find_program('catter.py')
-  catter = find_program('catter.py')
 
-  gen = generator(creator,
+gen = generator(creator,
   output: '@BASENAME@.h',
   arguments : ['@INPUT@', '@OUTPUT@'])
 
-  hs = gen.process('res1.txt', 'res2.txt')
+hs = gen.process('res1.txt', 'res2.txt')
 
-  allinone = custom_target('alltogether',
+allinone = custom_target('alltogether',
     input : hs,
     output : 'alltogether.h',
     command : [catter, '@INPUT@', '@OUTPUT@'])
 
-  executable('proggie', 'main.c', allinone)
+executable('proggie', 'main.c', allinone)
-else
+
-  error('MESON_SKIP_TEST: Skipping test on VS backend; see: https://github.com/mesonbuild/meson/issues/1004')
-endif