xrootd: add new version and variant (#27245)

- add version 5.3.2
- add krb variant
- add patch to not look for systemd

var/spack/repos/builtin/packages/xrootd/no-systemd.patch

@@ -0,0 +1,17 @@
+--- a/cmake/XRootDFindLibs.cmake	2021-07-29 12:22:48.000000000 +0000
++++ b/cmake/XRootDFindLibs.cmake	2021-10-25 18:26:07.308918231 +0000
+@@ -26,10 +26,10 @@
+   add_definitions( -DHAVE_XML2 )
+ endif()
+ 
+-find_package( Systemd )
+-if( SYSTEMD_FOUND )
+-  add_definitions( -DHAVE_SYSTEMD )
+-endif()
++#find_package( Systemd )
++#if( SYSTEMD_FOUND )
++#  add_definitions( -DHAVE_SYSTEMD )
++#endif()
+ 
+ find_package( CURL )
+ 

var/spack/repos/builtin/packages/xrootd/package.py

@@ -14,6 +14,7 @@ class Xrootd(CMakePackage):
     url      = "http://xrootd.org/download/v5.3.1/xrootd-5.3.1.tar.gz"
     list_url = 'https://xrootd.slac.stanford.edu/dload.html'
 
+    version('5.3.2', sha256='e8371fb9e86769bece74b9b9d67cb695023cd6a20a1199386fddd9ed840b0875')
     version('5.3.1', sha256='7ea3a112ae9d8915eb3a06616141e5a0ee366ce9a5e4d92407b846b37704ee98')
     version('5.1.0', sha256='c639536f1bdc5b6b365e807f3337ed2d41012cd3df608d40e91ed05f1c568b6d')
     version('5.0.3', sha256='be40a1897d6c1f153d3e23c39fe96e45063bfafc3cc073db88a1a9531db79ac5')
@@ -50,6 +51,9 @@ class Xrootd(CMakePackage):
     variant('readline', default=True,
             description='Use readline')
 
+    variant('krb5', default=False,
+            description='Build with KRB5 support')
+
     variant('cxxstd',
             default='11',
             values=('98', '11', '14', '17'),
@@ -67,10 +71,16 @@ class Xrootd(CMakePackage):
     depends_on('readline', when='+readline')
     depends_on('xz')
     depends_on('zlib')
+    depends_on('curl')
+    depends_on('krb5', when='+krb5')
+    depends_on('json-c')
 
     extends('python', when='+python')
     patch('python-support.patch', level=1, when='@:4.8+python')
 
+    # do not use systemd
+    patch('no-systemd.patch')
+
     def patch(self):
         """Remove hardcoded -std=c++0x flag
         """
@@ -86,6 +96,8 @@ def cmake_args(self):
             format('ON' if '+python' in spec else 'OFF'),
             '-DENABLE_READLINE:BOOL={0}'.
             format('ON' if '+readline' in spec else 'OFF'),
+            '-DENABLE_KRB5:BOOL={0}'.
+            format('ON' if '+krb5' in spec else 'OFF'),
             '-DENABLE_CEPH:BOOL=OFF'
         ]
         # see https://github.com/spack/spack/pull/11581