Prepare Depends Packages for Gitian Scripts

The gitian environment does not treat whitespaces in configure lines,
like most other systems. The solution is to just remove them.

contrib/depends/packages/sodium.mk

@@ -3,6 +3,7 @@ $(package)_version=1.0.15
 $(package)_download_path=https://download.libsodium.org/libsodium/releases/
 $(package)_file_name=libsodium-$($(package)_version).tar.gz
 $(package)_sha256_hash=fb6a9e879a2f674592e4328c5d9f79f082405ee4bb05cb6e679b90afe9e178f4
+$(package)_patches=fix-whitespace.patch
 
 define $(package)_set_vars
 $(package)_config_opts=--enable-static --disable-shared
@@ -11,6 +12,7 @@ endef
 
 define $(package)_config_cmds
   ./autogen.sh &&\
+  patch -p1 < $($(package)_patch_dir)/fix-whitespace.patch &&\
   $($(package)_autoconf) $($(package)_config_opts)
 endef