[vte] build: Make sure __BSD_VISIBLE is defined on freebsd

[Christian Persch <chpe src gnome org>]

commit 0372107ad01e84912ac6c4806f4b6b1c47d8634b
Author: Christian Persch <chpe src gnome org>
Date:   Sat Jun 25 20:37:29 2022 +0200

    build: Make sure __BSD_VISIBLE is defined on freebsd
    
    By not defining any of the other feature macros, it *should* enable all
    of them.
    
    https://gitlab.gnome.org/GNOME/vte/-/issues/2564

 meson.build | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)
---
diff --git a/meson.build b/meson.build
index 6a0629c8..15200e31 100644
--- a/meson.build
+++ b/meson.build
@@ -223,12 +223,10 @@ libc_feature_defines = [
 
 if host_machine.system() == 'freebsd'
   # Defining _POSIX_C_SOURCE above makes freebsd not expose some functionality
-  # that's hidden behind __BSD_VISIBLE.  Since there appears to be no other way
-  # to make everything visible, just forcibly define __BSD_VISIBLE.
+  # that's hidden behind __BSD_VISIBLE.  Not defininy any of the above however
+  # makes it expose verything.
 
-  libc_feature_defines += [
-    ['__BSD_VISIBLE', '1'],
-  ]
+  libc_feature_defines = []
 endif
 
 foreach f: libc_feature_defines