[FYI] {maint} depend2.am: improve comments a little

[Stefano Lattarini]

* lib/am/depend2.am: The "fastdep" mode is supported not only for
gcc 3.x, but for gcc 3.x or later, in particular, for all gcc in
the 4.x series (at the time of writing, the latest release is 4.72).
Adjust the comments to match, and re-wrap them while at it.

Signed-off-by: Stefano Lattarini <address@hidden>
---
 lib/am/depend2.am | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/lib/am/depend2.am b/lib/am/depend2.am
index 80d4185..18290e4 100644
--- a/lib/am/depend2.am
+++ b/lib/am/depend2.am
@@ -27,11 +27,10 @@
 ##   the "if AMDEP" chunk is prefix with @AMDEP_TRUE@ just like for any
 ##   other configure-time conditional.
 ##
-## We do likewise for %FASTDEP%; this expands to an ordinary
-## configure-time conditional.  %FASTDEP% is used to speed up the
-## common case of building a package with gcc 3.x.  In this case we
-## can skip the use of depcomp and easily inline the dependency
-## tracking.
+## We do likewise for %FASTDEP%; this expands to an ordinary configure-time
+## conditional.  %FASTDEP% is used to speed up the common case of building
+## a package with gcc 3.x or later.  In this case we can skip the use of
+## depcomp and easily inline the dependency tracking.
 
 ## Verbosity of FASTDEP rules
 ## --------------------------
-- 
1.8.1.rc3.192.g2d0029e