build: ensure symbols are exported for libsysprof-6

This fixes an issue where the symbols are not getting T as they are dropped
when pulling in the static archive.

This compiles twice, but that is fine for now until we come up with something
better in the long run.

src/libsysprof/meson.build

@@ -207,6 +207,7 @@ libsysprof_static = static_library(
                           libsysprof_capture_include_dirs],
            dependencies: libsysprof_deps,
   gnu_symbol_visibility: 'hidden',
+                 c_args: release_flags,
 )
 
 libsysprof_static_dep = declare_dependency(
@@ -218,11 +219,19 @@ libsysprof_static_dep = declare_dependency(
 )
 
 libsysprof = library('sysprof-@0@'.format(soname_major_version),
-           dependencies: [libsysprof_static_dep],
+  libsysprof_public_sources +
+  libsysprof_private_sources +
+  libsysprof_enums,
+  libsysprof_resources,
+
+    include_directories: [include_directories('.'),
+                          libsysprof_capture_include_dirs],
+           dependencies: libsysprof_deps,
   gnu_symbol_visibility: 'hidden',
                 version: '@0@.0.0'.format(soname_major_version),
         darwin_versions: '@0@.0'.format(soname_major_version),
                 install: get_option('libsysprof'),
+                 c_args: release_flags,
 )
 
 libsysprof_dep = declare_dependency(