[New Package] libfmt (#5156)

* [New Package] libfmt

* Create builddir directory

packages/libfmt.rb

+require 'package'
+
+class Libfmt < Package
+  description 'A modern formatting library'
+  homepage 'https://fmt.dev'
+  version '7.1.3'
+  compatibility 'all'
+  source_url 'https://github.com/fmtlib/fmt/releases/download/7.1.3/fmt-7.1.3.zip'
+  source_sha256 '5d98c504d0205f912e22449ecdea776b78ce0bb096927334f80781e720084c9f'
+
+  def self.build
+    Dir.mkdir "builddir"
+    Dir.chdir "builddir" do
+      system "cmake #{CREW_CMAKE_OPTIONS} \
+              -DBUILD_SHARED_LIBS=TRUE \
+              .."
+      system "make"
+    end
+  end
+
+  def self.install
+    Dir.chdir "builddir" do
+      system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+    end
+  end
+
+  def self.check
+    Dir.chdir "builddir" do
+      system "make", "test"
+    end
+  end
+end