Do not strip libraries in release_mode.

Meson use gcc's `-s` option to create the archive.
This option should make gcc meemic `ar` tool but in some version of gcc,
it seems there is a bug and the `-s` option is not taken into account.

See https://github.com/mesonbuild/meson/issues/4138

So, do not try to strip libraries. We will strip the final binaries anyway.

kiwixbuild/dependencies/kiwix_lib.py

@@ -13,6 +13,7 @@ class Kiwixlib(Dependency):
 
     class Builder(MesonBuilder):
         dependencies = ["pugixml", "libzim", "zlib", "lzma", "libcurl", "icu4c", "mustache"]
+        strip_option = ''
 
         @property
         def configure_option(self):

kiwixbuild/dependencies/libzim.py

@@ -14,6 +14,7 @@ class Libzim(Dependency):
     class Builder(MesonBuilder):
         test_option = "-t 8"
         dependencies = ['zlib', 'lzma', 'xapian-core', 'icu4c']
+        strip_option = ''
 
         @property
         def configure_option(self):