boost: fix patch

packages/boost/tools-build-src-tools-common.jam.patch

@@ -1,19 +1,16 @@
-diff -u -r ../boost_1_70_0/tools/build/src/tools/common.jam ./tools/build/src/tools/common.jam
---- ../boost_1_70_0/tools/build/src/tools/common.jam	2019-04-09 19:36:57.000000000 +0000
-+++ ./tools/build/src/tools/common.jam	2019-05-05 22:41:59.313215785 +0000
-@@ -980,10 +980,11 @@
+diff -uNr boost_1_72_0/tools/build/src/tools/common.jam boost_1_72_0.mod/tools/build/src/tools/common.jam
+--- boost_1_72_0/tools/build/src/tools/common.jam	2019-12-10 02:20:17.000000000 +0200
++++ boost_1_72_0.mod/tools/build/src/tools/common.jam	2020-01-13 01:11:52.367381897 +0200
+@@ -979,12 +979,6 @@
+         version = $(version[1]) ;
      }
  
-     # Ditto, from Clang 4
--    if ( $(tag) = clang || $(tag) = clangw ) && [ numbers.less 3 $(version[1]) ]
+-    # Ditto, from Clang 4
+-    if ( $(tag) = clang || $(tag) = clangw ) && $(version[1]) && [ numbers.less 3 $(version[1]) ]
 -    {
 -        version = $(version[1]) ;
 -    }
-+    # See https://github.com/boostorg/build/issues/385
-+    #if ( $(tag) = clang || $(tag) = clangw ) && [ numbers.less 3 $(version[1]) ]
-+    #{
-+    #    version = $(version[1]) ;
-+    #}
- 
+-
      # On intel, version is not added, because it does not matter and it is the
      # version of vc used as backend that matters. Ideally, we should encode the
+     # backend version but that would break compatibility with V1.