[llvm] Enable building Analysis plugins on Cygwin (llvm#151397)

In llvm#112303 they were enabled for Windows dylib builds, but the condition
excluded Cygwin in that case. Their dynamic libraries work the same way,
so adjust the condition accordingly.

This fixes the plugin tests on Cygwin.

Author: jeremyd2019

llvm/unittests/Analysis/InlineAdvisorPlugin/CMakeLists.txt

@@ -2,7 +2,7 @@
 # libraries, but expects them to exist in the process loading the plugin. This 
 # doesn't work with DLLs on Windows (where a shared library can't have undefined
 # references), so just skip this testcase on Windows.
-if ((NOT WIN32 OR LLVM_BUILD_LLVM_DYLIB) AND NOT CYGWIN)
+if ((NOT WIN32 AND NOT CYGWIN) OR LLVM_BUILD_LLVM_DYLIB)
   unset(LLVM_LINK_COMPONENTS)
   add_llvm_library(InlineAdvisorPlugin MODULE BUILDTREE_ONLY
     InlineAdvisorPlugin.cpp

llvm/unittests/Analysis/InlineOrderPlugin/CMakeLists.txt

@@ -2,7 +2,7 @@
 # libraries, but expects them to exist in the process loading the plugin. This 
 # doesn't work with DLLs on Windows (where a shared library can't have undefined
 # references), so just skip this testcase on Windows.
-if ((NOT WIN32 OR LLVM_BUILD_LLVM_DYLIB) AND NOT CYGWIN)
+if ((NOT WIN32 AND NOT CYGWIN) OR LLVM_BUILD_LLVM_DYLIB)
   unset(LLVM_LINK_COMPONENTS)
   add_llvm_library(InlineOrderPlugin MODULE BUILDTREE_ONLY
     InlineOrderPlugin.cpp