perl: fix build errors on macOS

Added a check for macOS 11 and newer to resolve a compile error:
*** Unexpected product version 11.2.

Added Internals::getcwd.
Fallback to the built-in getcwd to resolve compile errors on macOS:
Can't locate Errno.pm in @INC
/miniperl not found

Signed-off-by: Georgi Valkov <gvalkov@abv.bg>

lang/perl/patches/998-Errno_errno.h_path.patch

@@ -1,6 +1,6 @@
 --- a/ext/Errno/Errno_pm.PL
 +++ b/ext/Errno/Errno_pm.PL
-@@ -133,7 +133,7 @@
+@@ -133,7 +133,7 @@ sub get_files {
  	# Some Linuxes have weird errno.hs which generate
  	# no #file or #line directives
  	my ($linux_errno_h) = grep { -e $_ } map { "$_/errno.h" }