libuv: Remove kvm dependency for all BSDs except NetBSD

This dependency is not expressed in upstream libuv.  It was added to
CMake by commit 6a497bb0a3 (libuv: Link with kvm on FreeBSD, 2016-09-08,
v3.7.0-rc1~143^2~1).  It is needed only on NetBSD.

Fixes: #26722

Utilities/cmlibuv/CMakeLists.txt

@@ -219,7 +219,6 @@ endif()
 
 if(CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
   list(APPEND uv_libraries
-    kvm
     )
   list(APPEND uv_headers
     include/uv/bsd.h
@@ -236,7 +235,6 @@ endif()
 if(CMAKE_SYSTEM_NAME STREQUAL "kFreeBSD")
   list(APPEND uv_libraries
     freebsd-glue
-    kvm
     )
   list(APPEND uv_headers
     include/uv/bsd.h
@@ -268,7 +266,6 @@ endif()
 
 if(CMAKE_SYSTEM_NAME STREQUAL "OpenBSD")
   list(APPEND uv_libraries
-    kvm
     )
   list(APPEND uv_headers
     include/uv/bsd.h

bootstrap

@@ -1783,10 +1783,12 @@ else
       libs="${libs} -ldl -lrt"
       ;;
     *kFreeBSD*)
-      libs="${libs} -lkvm -lfreebsd-glue"
+      libs="${libs} -lfreebsd-glue"
+      ;;
+    *NetBSD*)
+      libs="${libs} -lkvm"
       ;;
     *BSD*)
-      libs="${libs} -lkvm"
       ;;
     *SunOS*)
       uv_c_flags="${uv_c_flags} -D__EXTENSIONS__ -D_XOPEN_SOURCE=600"