added flex 2.5.37

Golden_Repo/f/flex/flex-2.5.37-GCC-11.3.0.eb

+name = 'flex'
+version = '2.5.37'
+
+homepage = 'http://flex.sourceforge.net/'
+description = """Flex (Fast Lexical Analyzer) is a tool for generating scanners. A scanner, 
+sometimes called a tokenizer, is a program which recognizes lexical patterns in text."""
+
+toolchain = {'name': 'GCC', 'version': '11.3.0'}
+toolchainopts = {'pic': True}
+
+source_urls = ['http://prdownloads.sourceforge.net/%s' % name.lower()]
+sources = ['%s-%s.tar.gz' % (name.lower(), version)]
+checksums = ['bf693433a3effe6b1f42e44abd787491e4e213984b1859545b92267a86088dd3']