Many typo fixes from Karsten Weiss

Spotted using https://github.com/lucasdemarchi/codespell
diff --git a/configure.ac b/configure.ac
index 663062b..1e9f741 100644
--- a/configure.ac
+++ b/configure.ac
@@ -274,7 +274,7 @@
     [ AC_MSG_RESULT([yes]) ],
     [ AC_MSG_RESULT([no])
       AC_DEFINE(NO_ATTRIBUTE_ON_PROTOTYPE_ARGS, 1,
-	 [compiler does not accept __attribute__ on protoype args]) ]
+	 [compiler does not accept __attribute__ on prototype args]) ]
 )
 
 if test "x$no_attrib_nonnull" != "x1" ; then
@@ -514,7 +514,7 @@
 	# Some versions of VAC won't allow macro redefinitions at
 	# -qlanglevel=ansi, and autoconf 2.60 sometimes insists on using that
 	# particularly with older versions of vac or xlc.
-	# It also throws errors about null macro argments, but these are
+	# It also throws errors about null macro arguments, but these are
 	# not fatal.
 	AC_MSG_CHECKING([if compiler allows macro redefinitions])
 	AC_COMPILE_IFELSE(
@@ -753,7 +753,7 @@
 	PATH="$PATH:/usr/etc"
 	AC_DEFINE([WITH_IRIX_ARRAY], [1],
 		[Define if you have/want arrays
-		(cluster-wide session managment, not C arrays)])
+		(cluster-wide session management, not C arrays)])
 	AC_DEFINE([WITH_IRIX_PROJECT], [1],
 		[Define if you want IRIX project management])
 	AC_DEFINE([WITH_IRIX_AUDIT], [1],
@@ -3005,7 +3005,7 @@
 
 ### Configure cryptographic random number support
 
-# Check wheter OpenSSL seeds itself
+# Check whether OpenSSL seeds itself
 if test "x$openssl" = "xyes" ; then
 	AC_MSG_CHECKING([whether OpenSSL's PRNG is internally seeded])
 	AC_RUN_IFELSE(
@@ -3904,7 +3904,7 @@
 
 AC_CHECK_TYPES([struct timespec])
 
-# We need int64_t or else certian parts of the compile will fail.
+# We need int64_t or else certain parts of the compile will fail.
 if test "x$ac_cv_have_int64_t" = "xno" && \
 	test "x$ac_cv_sizeof_long_int" != "x8" && \
 	test "x$ac_cv_sizeof_long_long_int" = "x0" ; then