Framework: Rewrite nodejs.mk and reorganize www/{node,npm,yarn}

The current USES=nodejs has the following issues:
- www/node is not the default version while www/node16 is.
- It also means inconsistent naming of node ports.
- www/npm duplicates with www/npm-node16.
- www/yarn duplicates with www/yarn-node16.

The notable changes are introduced to fix the above issues:
- Rewrite Mk/Uses/nodejs.mk.
- Add new LTS version of nodejs (www/noe18).
- Add new current version of nodejs (www/node19).
- Change default nodejs version from 16 to 18 (latest LTS).
- Use consistent naming for all supported node versions.
- Convert www/node, www/npm and www/yarn to meta ports.

After this commit:
- All supported node versions are named as node{14,16,18,19}
- www/node is a meta port which depends on the default version (e.g. www/node18)
- www/npm is a meta port which depends on the default version (e.g. www/npm-node18)
- www/yarn is a meta port which depends on the default version (e.g. www/yarn-node18)
- Bump PORTREVISION of dependent ports for dependency change (from www/node16 to www/node18)

Discussed with:	jrm, otis, pizzamig

1 files changed, 13 insertions, 0 deletions

diff --git a/www/node18/files/extra-patch-common.gypi b/www/node18/files/extra-patch-common.gypi
new file mode 100644
index 000000000000..8e817a2959c9
--- /dev/null
+++ b/www/node18/files/extra-patch-common.gypi
@@ -0,0 +1,13 @@
+--- common.gypi.orig	2019-10-01 15:32:40.000000000 +0200
++++ common.gypi	2019-10-16 12:47:09.236138000 +0200
+@@ -390,8 +390,8 @@
+             'ldflags': [ '-m32' ],
+           }],
+           [ 'target_arch=="ppc64" and OS!="aix"', {
+-            'cflags': [ '-m64', '-mminimal-toc' ],
+-            'ldflags': [ '-m64' ],
++            'cflags': [ '-m64' ],
++            'ldflags': [ '-m64' ],
+           }],
+           [ 'target_arch=="s390x"', {
+             'cflags': [ '-m64', '-march=z196' ],