build script: add flac target

.gitignore

@@ -9,6 +9,9 @@
 
 /deps/bzip2/bin/
 /deps/bzip2/man/
+/deps/flac/bin/
+/deps/flac/include/FLAC++/
+/deps/flac/lib/libFLAC++.a
 /deps/jpeg-turbo/bin/
 /deps/jpeg-turbo/include/turbojpeg.h
 /deps/jpeg-turbo/lib/libturbojpeg.a

build.py

@@ -624,6 +624,19 @@ class Bzip2Target(MakeTarget):
         self.install(builder, self.options)
 
 
+class FLACTurboTarget(ConfigureMakeStaticDependencyTarget):
+    def __init__(self, name='flac'):
+        super().__init__(name)
+
+    def prepare_source(self, builder: 'Builder'):
+        builder.download_source(
+            'https://downloads.xiph.org/releases/flac/flac-1.3.3.tar.xz',
+            '213e82bd716c9de6db2f98bcadbc4c24c7e2efe8c75939a1a84e28539c4e1748')
+
+    def detect(self, builder: 'Builder') -> bool:
+        return os.path.exists(builder.source_path + 'FLAC/flac.pc.in')
+
+
 class JpegTurboTarget(CMakeStaticDependencyTarget):
     def __init__(self, name='jpeg-turbo'):
         super().__init__(name)
@@ -913,6 +926,7 @@ class Builder(object):
 
             # Dependencies
             Bzip2Target(),
+            FLACTurboTarget(),
             JpegTurboTarget(),
             NasmTarget(),
             OggTarget(),