Fixed some typos, courtesy of codespell

configure.ac

@@ -68,7 +68,7 @@ ARG_WITH_SET([dev-headers],          [no], [install strongSwan development heade
 ARG_WITH_SET([printf-hooks],         [auto], [force the use of a specific printf hook implementation (auto, builtin, glibc, vstr).])
 ARG_WITH_SET([rubygemdir],           ["gem environment gemdir"], [path to install ruby gems to])
 ARG_WITH_SET([testable-ke],          [yes], [make key exchange implementations testable by providing a set_seed() method])
-ARG_WITH_SET([plugins-packaged-seperately], [no], [changes e.g. log messages for distributions that package plugins seperately])
+ARG_WITH_SET([plugins-packaged-separately], [no], [changes e.g. log messages for distributions that package plugins separately])
 
 if test -n "$PKG_CONFIG"; then
 	systemdsystemunitdir_default=$($PKG_CONFIG --variable=systemdsystemunitdir systemd)

src/libcharon/kernel/kernel_interface.h

@@ -312,7 +312,7 @@ struct kernel_interface_t {
 	 * The returned host is allocated and must be destroyed.
 	 * An optional src address can be used to check if a route is available
 	 * for the given source to dest.
-	 * 0.0.0.0/:: may get returend if an interface but no next hop can be
+	 * 0.0.0.0/:: may get returned if an interface but no next hop can be
 	 * determined.
 	 *
 	 * @param dest			target destination address

src/libcharon/kernel/kernel_net.h

@@ -85,7 +85,7 @@ struct kernel_net_t {
 	 * The returned host is allocated and must be destroyed.
 	 * An optional src address can be used to check if a route is available
 	 * for the given source to dest.
-	 * 0.0.0.0/:: may get returend if an interface but no next hop can be
+	 * 0.0.0.0/:: may get returned if an interface but no next hop can be
 	 * determined.
 	 *
 	 * @param dest			target destination address