[flac] add patch for Android < 21

Author: kambala-decapitator

conan_patches/flac/conandata.yml

@@ -0,0 +1,4 @@
+patches:
+  "1.4.2":
+    - patch_file: "patches/android-pre-21.diff"
+      patch_description: "https://github.com/android/ndk/issues/1108"

conan_patches/flac/patches/android-pre-21.diff

@@ -0,0 +1,11 @@
+--- a/src/flac/utils.c	
++++ b/src/flac/utils.c
+@@ -200,7 +200,7 @@ size_t strlen_console(const char *text)
+ {
+ #ifdef _WIN32
+ 	return strlen_utf8(text);
+-#elif defined(__DJGPP__) /* workaround for DJGPP missing wcswidth() */
++#elif defined(__DJGPP__) || (defined(__ANDROID_API__) && __ANDROID_API__ < 21)
+ 	return strlen(text);
+ #else
+ 	size_t len;