Reinstate original libepoxy w/GCCcore-8.3.0

easybuild/easyconfigs/l/libepoxy/libepoxy-1.5.4-GCCcore-8.3.0.eb

@@ -0,0 +1,36 @@
+easyblock = 'MesonNinja'
+
+name = 'libepoxy'
+version = '1.5.4'
+
+homepage = 'https://github.com/anholt/libepoxy'
+description = "Epoxy is a library for handling OpenGL function pointer management for you"
+
+toolchain = {'name': 'GCCcore', 'version': '8.3.0'}
+
+github_account = 'anholt'
+source_urls = [GITHUB_LOWER_SOURCE]
+sources = ['%(version)s.tar.gz']
+checksums = ['c926fcc606901f3e03e371027056fd478da43e01ce2da7ffc48b5a0de0ca107c']
+
+builddependencies = [
+    ('binutils', '2.32'),
+    ('Meson', '0.51.2', '-Python-3.7.4'),
+    ('Ninja', '1.9.0'),
+    ('pkg-config', '0.29.2'),
+]
+
+dependencies = [
+    ('X11', '20190717'),
+    ('Mesa', '19.1.7'),
+]
+
+configopts = '-Degl=no --libdir %(installdir)s/lib '
+
+sanity_check_paths = {
+    'files': ['include/epoxy/%s' % x for x in ['common.h', 'gl_generated.h', 'gl.h', 'glx_generated.h', 'glx.h']] +
+             ['lib/libepoxy.%s' % SHLIB_EXT],
+    'dirs': ['lib']
+}
+
+moduleclass = 'lib'