meson: fix some defines misspelled errors in meson.build

Defines
- HAVE_FUNC_ATTRIBUTE_RETURNS_NONNULL
- HAVE_FUNC_ATTRIBUTE_VISIBILITY
were misspelled.

Signed-off-by: Marc Dietrich <marvin24@gmx.de>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>
diff --git a/meson.build b/meson.build
index f3179c3..97619f7 100644
--- a/meson.build
+++ b/meson.build
@@ -692,14 +692,14 @@
 endif
 if cc.compiles('int *foo(void) __attribute__((returns_nonnull));',
                name : '__attribute__((returns_nonnull))')
-  pre_args += '-DHAVE_FUNC_ATTRIBUTE_NONNULL'
+  pre_args += '-DHAVE_FUNC_ATTRIBUTE_RETURNS_NONNULL'
 endif
 if cc.compiles('''int foo_def(void) __attribute__((visibility("default")));
                   int foo_hid(void) __attribute__((visibility("hidden")));
                   int foo_int(void) __attribute__((visibility("internal")));
                   int foo_pro(void) __attribute__((visibility("protected")));''',
                name : '__attribute__((visibility(...)))')
-  pre_args += '-DHAVE_FUNC_ATTRIBUTE_VISBILITY'
+  pre_args += '-DHAVE_FUNC_ATTRIBUTE_VISIBILITY'
 endif
 if cc.compiles('int foo(void) { return 0; } int bar(void) __attribute__((alias("foo")));',
                name : '__attribute__((alias(...)))')