meson: fix DLL prefix

meson was creating cygXXX DLLs instead of msys-XXX DLLs.
This extends the cygwin patch to fix that.

meson/PKGBUILD

@@ -2,7 +2,7 @@
 
 pkgname=meson
 pkgver=0.55.3
-pkgrel=1
+pkgrel=2
 pkgdesc='High-productivity build system'
 arch=('any')
 url="https://mesonbuild.com/"
@@ -11,7 +11,7 @@ depends=('python' 'python-setuptools' 'ninja')
 source=("https://github.com/mesonbuild/${pkgname}/releases/download/${pkgver}/${pkgname}-${pkgver}.tar.gz"
         "cygwin-disguise.patch")
 sha256sums=('6bed2a25a128bbabe97cf40f63165ebe800e4fcb46db8ab7ef5c2b5789f092a5'
-            '94eccd752284a08811c41b2afd1801ccc0274affac7ada5356b413a8f0f43164')
+            '17842839cda27fbcd4e2a03b1ff660e6d46bf8d55985129273ac28a64efc2275')
 
 prepare() {
   cd "${srcdir}/${pkgname}-${pkgver}"

meson/cygwin-disguise.patch

@@ -61,3 +61,42 @@ index 84abfc33..59aabff0 100644
  
  def run_with_mono(fname):
      if fname.endswith('.exe') and not (is_windows() or is_cygwin()):
+diff --git a/mesonbuild/build.py b/mesonbuild/build.py
+index be9763489..b7a5e0483 100644
+--- a/mesonbuild/build.py
++++ b/mesonbuild/build.py
+@@ -1785,7 +1785,7 @@ class SharedLibrary(BuildTarget):
+             self.gcc_import_filename = '{0}{1}.dll.a'.format(self.prefix if self.prefix is not None else 'lib', self.name)
+             # Shared library is of the form cygfoo.dll
+             # (ld --dll-search-prefix=cyg is the default)
+-            prefix = 'cyg'
++            prefix = 'msys-'
+             # Import library is called libfoo.dll.a
+             self.import_filename = self.gcc_import_filename
+             if self.soversion:
+diff --git a/mesonbuild/compilers/mixins/clike.py b/mesonbuild/compilers/mixins/clike.py
+index e146f5f62..9b787eae3 100644
+--- a/mesonbuild/compilers/mixins/clike.py
++++ b/mesonbuild/compilers/mixins/clike.py
+@@ -1043,7 +1043,7 @@ class CLikeCompiler(Compiler):
+             stlibext += ['lib']
+         elif env.machines[self.for_machine].is_cygwin():
+             shlibext = ['dll', 'dll.a']
+-            prefixes = ['cyg'] + prefixes
++            prefixes = ['msys-'] + prefixes
+         else:
+             # Linux/BSDs
+             shlibext = ['so']
+diff --git a/run_unittests.py b/run_unittests.py
+index db61ca6b1..16ce7e960 100755
+--- a/run_unittests.py
++++ b/run_unittests.py
+@@ -1887,6 +1887,8 @@ class BasePlatformTests(unittest.TestCase):
+         base = os.path.splitext(filename)[0]
+         if base.startswith(('lib', 'cyg')):
+             return base[3:]
++        if base.startswith('msys-'):
++            return base[5:]
+         return base
+ 
+     def assertBuildRelinkedOnlyTarget(self, target):