Placate a number of `syntax-check' verifications.

- "filesystem" -> "file system"
  - remove doubled words
  - use EXIT_* macros instead of literal numbers
  - update `syntax-check' exclusion files

test-suite/lib.scm

@@ -119,7 +119,7 @@
 ;;;;
 ;;;; * (pass-if-exception name exception body) will pass if the execution of
 ;;;;   body causes the given exception to be thrown.  If no exception is
-;;;;   thrown, the test fails.  If some other exception is thrown, is is an
+;;;;   thrown, the test fails.  If some other exception is thrown, it is an
 ;;;;   error.
 ;;;; * (expect-fail-exception name exception body) will pass unexpectedly if
 ;;;;   the execution of body causes the given exception to be thrown.  If no

test-suite/tests/r4rs.test

@@ -35,7 +35,7 @@
 ;;;; Author: Aubrey Jaffer
 ;;;; Modified: Mikael Djurfeldt
 ;;;;   Removed tests which Guile deliberately
-;;;;   won't pass.  Made the the tests (test-cont), (test-sc4), and
+;;;;   won't pass.  Made the tests (test-cont), (test-sc4), and
 ;;;;   (test-delay) start to run automatically.
 ;;;; Modified: Jim Blandy
 ;;;;   adapted to new Guile test suite framework

test-suite/tests/srfi-67.test

@@ -36,7 +36,7 @@
 ; Test engine
 ; ===========
 ;
-; We use an extended version of the the checker of SRFI-42 (with
+; We use an extended version of the checker of SRFI-42 (with
 ; Felix' reduction on codesize) for running a batch of tests for
 ; the various procedures of 'compare.scm'. Moreover, we use the
 ; comprehensions of SRFI-42 to generate examples systematically.

test-suite/tests/statprof.test

@@ -75,7 +75,7 @@
 
         (let ((drift-fraction (/ max-diff average)))
           (or (< drift-fraction max-allowed-drift)
-              ;; don't stop the the test suite for what statistically is
+              ;; don't stop the test suite for what statistically is
               ;; bound to happen.
               (throw 'unresolved (pk average drift-fraction))))))))