[sysprof] build: require libunwind unless disabled

[Christian Hergert <chergert src gnome org>]

commit 75364415b329c1957ffa27be50c520fd44415b6f
Author: Christian Hergert <chergert redhat com>
Date:   Thu Nov 4 19:48:29 2021 -0700

    build: require libunwind unless disabled
    
    Only some situations can use this properly without libunwind, so make
    sure that we have it available unless -Dlibunwind=false.
    
    Distributors, please be kind, use libunwind!

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index e8f31054..8feed80a 100644
--- a/meson.build
+++ b/meson.build
@@ -81,7 +81,7 @@ config_h.set10('HAVE_POLKIT_AGENT', polkit_agent_dep.found())
 config_h.set10('HAVE_POLKIT', polkit_dep.found())
 
 if get_option('libunwind')
-  libunwind_dep = dependency('libunwind-generic', required: false)
+  libunwind_dep = dependency('libunwind-generic')
   config_h.set('ENABLE_LIBUNWIND', libunwind_dep.found())
   config_h.set('HAVE_UNW_SET_CACHE_SIZE', libunwind_dep.found() and cc.has_header_symbol('libunwind.h', 
'unw_set_cache_size', dependencies: [libunwind_dep]))
 endif