libomp: add python310 build dep

Also restrict perl5 dep to older version.

Fixes: https://trac.macports.org/ticket/71149

lang/libomp/Portfile

@@ -19,7 +19,6 @@ long_description        {*}${description} is intended to contain all of the\
                         with +openmp variant for clang-3.7.)
 
 categories              lang
-platforms               darwin
 supported_archs         arm64 i386 x86_64
 license                 {MIT NCSA}
 
@@ -60,6 +59,12 @@ if {${os.platform} eq "darwin" && ${configure.cxx_stdlib} ne "libstdc++"} {
         configure.cflags-append -stdlib=libc++
     }
 
+    # Last python version to not require C11 (and thus a clang
+    # dependency on some OS versions). Used by libpsl (which is a
+    # dependency of cmake) for the same reason.
+    depends_build-append    port:python310
+    configure.args-append   -DPython3_EXECUTABLE=${prefix}/bin/python3.10
+
     # Build requires std::atomic
     configure.cxxflags-append -std=c++11
     compiler.cxx_standard     2011
@@ -94,11 +99,12 @@ if {${os.platform} eq "darwin" && ${configure.cxx_stdlib} ne "libstdc++"} {
         depends_build-replace  \
                         path:bin/cmake:cmake port:cmake-bootstrap
         configure.cmd   ${prefix}/libexec/cmake-bootstrap/bin/cmake
+
+        depends_build-append    port:perl5
     }
     livecheck.type      none
 }
 
-depends_build-append    port:perl5
 cmake.out_of_source     yes
 
 # According to documentation builds with clang >= 3.3
@@ -193,4 +199,3 @@ notes "
 
 test.run                yes
 test.target             libomp-micro-tests
-