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Fix build on FreeBSD by guarding <features.h> include

<features.h> is glibc-specific and not available on FreeBSD or other
non-Linux systems. The musl/glibc detection logic in ft2_unicode.c was
previously enabled for all non-Windows and non-Apple platforms, which
caused build failures on FreeBSD.

Restrict the probe to Linux only and use __has_include(<features.h>) to
safely include it. This preserves musl/glibc detection on Linux while
allowing FreeBSD and other non-Linux systems to build successfully.

--- a/src/ft2_unicode.c

+++ b/src/ft2_unicode.c

@@ -4,20 +4,21 @@

 #endif

 // for detecting if musl or glibc is used

-#if !defined _WIN32 && !defined __APPLE__

-	#ifndef _GNU_SOURCE

-		#define _GNU_SOURCE

-	  #include <features.h>

-	  #ifndef __USE_GNU

-	      #define __MUSL__

-	  #endif

-	  #undef _GNU_SOURCE /* don't contaminate other includes unnecessarily */

-	#else

-	  #include <features.h>

-	  #ifndef __USE_GNU

-	      #define __MUSL__

-	  #endif

-	#endif

+#if defined(__linux__)

+  /* Only Linux has glibc's <features.h>. On BSDs (including FreeBSD) and others,

+     skip this block to avoid a missing-header error. */

+  #ifdef __has_include

+    #if __has_include(<features.h>)

+      #include <features.h>

+    #endif

+  #else

+    /* If the compiler doesn't support __has_include, assume features.h exists on glibc. */

+    #include <features.h>

+  #endif

+  /* If <features.h> didn't define glibc's GNU extensions, assume musl. */

+  #ifndef __USE_GNU

+    #define __MUSL__

+  #endif

 #endif

 #include <stdlib.h>

-- 

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