perl: define $sysroot for extensions

Signed-off-by: Alexander Ryzhov <github@ryzhov-al.ru>
Signed-off-by: Rosen Penev <rosenp@gmail.com>
(cherry picked from commit fed1b3b11b)

lang/perl/Makefile

@@ -11,7 +11,7 @@ include perlver.mk
 
 PKG_NAME:=perl
 PKG_VERSION:=$(PERL_VERSION)
-PKG_RELEASE:=3
+PKG_RELEASE:=4
 
 PKG_SOURCE_URL:=\
 		https://cpan.metacpan.org/src/5.0 \
@@ -105,6 +105,7 @@ define Build/Configure
 	                                -Dowrt:threads=$(if $(CONFIG_PERL_THREADS),yes,no) \
 	                                -Dowrt:staging_dir='$(STAGING_DIR)' \
 	                                -Dowrt:host_perl_prefix='$(HOST_PERL_PREFIX)' \
+	                                -Dsysroot='$(TOOLCHAIN_DIR)' \
 	                                files/version.config \
 	                                files/base.config \
 	                                files/$(patsubst i386,i486,$(ARCH)).config \

lang/perl/files/base.config

@@ -938,7 +938,6 @@ stdio_ptr='((fp)->_ptr)'
 stdio_stream_array=''
 submit=''
 sysman='/usr/share/man/man1'
-sysroot=''
 tail=''
 tar=''
 targetdir=''

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

@@ -0,0 +1,11 @@
+--- a/ext/Errno/Errno_pm.PL
++++ b/ext/Errno/Errno_pm.PL
+@@ -133,7 +133,7 @@
+ 	# Some Linuxes have weird errno.hs which generate
+ 	# no #file or #line directives
+ 	my ($linux_errno_h) = grep { -e $_ } map { "$_/errno.h" }
+-	    "$sysroot/usr/include", "$sysroot/usr/local/include",
++	    "$sysroot/usr/include", "$sysroot/usr/local/include", "$sysroot/include",
+ 	    split / / => $Config{locincpth} or
+ 		die "Cannot find errno.h";
+ 	$file{$linux_errno_h} = 1;