msys2-runtime: fix dodgy logic in patch conversion space calculation

msys2-runtime/0003-Add-msys2_path_conv.patch

@@ -920,7 +920,7 @@ diff -Naur a/winsup/cygwin/path.cc b/winsup/cygwin/path.cc
 -  if (isabswinpath (arg) 
 -      || (strchr (arg, ';') > 0)
 -      )
-+  size_t stack_len = (((MAX_PATH - arglen) > 0) ? MAX_PATH : arglen + MAX_PATH);
++  size_t stack_len = arglen + MAX_PATH;
 +  char * stack_path = (char *)malloc (stack_len);
 +  memset (stack_path, 0, MAX_PATH);
 +  if (!stack_len)

msys2-runtime/PKGBUILD

@@ -21,7 +21,7 @@ source=('msys2-runtime'::'git+https://github.com/Alexpux/Cygwin.git#branch=devel
 md5sums=('SKIP'
          '85fabbc5d9cdb46cf73da9654f2c83bc'
          'ace414fde822ae633183fe94cbb0e1d9'
-         'fd8d1ad7bbffbb655cc311bb70d75e49'
+         '57a5c1bbc3796552f1e08953c7f73a75'
          '4e39847e44316ae7376323e0b7538504')
 pkgver() {
 	cd "$srcdir/msys2-runtime"