Add sassc 3.6.2 (mesonbuild#1185)

This is a direct copy of https://github.com/lazka/sassc/tree/meson
which I've created for gtk back in the days.

This project is in a similar situation as mesonbuild#1153. There exists
an upstream PR for adding meson (sass/sassc#269),
but the project is unmaintained, so unlikely to see progress there.

releases.json

@@ -2494,6 +2494,14 @@
       "4.1.0-1"
     ]
   },
+  "sassc": {
+    "program_names": [
+      "sassc"
+    ],
+    "versions": [
+      "3.6.2-1"
+    ]
+  },
   "sdl2": {
     "dependency_names": [
       "sdl2",

subprojects/packagefiles/sassc/meson.build

@@ -0,0 +1,47 @@
+project('sassc', 'c',
+        version: '3.6.2',
+        meson_version : '>= 0.48.0',
+        default_options: [
+            'c_std=c99',
+            'buildtype=debugoptimized',
+        ])
+
+version_conf_data = configuration_data()
+version_conf_data.set('PACKAGE_VERSION', meson.project_version())
+
+add_project_arguments(
+  '-D_POSIX_C_SOURCE',
+  '-DSASSC_VERSION="@0@"'.format(meson.project_version()),
+  language: ['c'])
+
+configure_file(
+  input: 'sassc_version.h.in',
+  output: 'sassc_version.h',
+  configuration: version_conf_data)
+
+libsass_dep = dependency(
+  'libsass',
+  fallback: ['libsass', 'libsass_dep'])
+
+sassc_sources = ['sassc.c']
+
+incs = []
+if host_machine.system() == 'windows'
+  windows = import('windows')
+  win_res = windows.compile_resources(
+    'res/libsass.rc',
+    depend_files: ['res/libsass.ico'])
+  sassc_sources += win_res
+  incs += include_directories('win/posix')
+  sassc_sources += 'win/posix/getopt.c'
+endif
+
+sassc = executable(
+  'sassc',
+  sassc_sources,
+  dependencies: [libsass_dep],
+  include_directories: incs,
+  install: true,
+)
+
+meson.override_find_program('sassc', sassc)

subprojects/sassc.wrap

@@ -0,0 +1,9 @@
+[wrap-file]
+directory = sassc-3.6.2
+source_url = https://github.com/sass/sassc/archive/refs/tags/3.6.2.tar.gz
+source_filename = sassc-3.6.2.tar.gz
+source_hash = 608dc9002b45a91d11ed59e352469ecc05e4f58fc1259fc9a9f5b8f0f8348a03
+patch_directory = sassc
+
+[provide]
+program_names = sassc