[svn-r17217] Bug fix (1468)

PathScale was mistaken as the Gcc compiler such that gcc flags were added
to it but PathScale did not honor many of them. (e.g. -Wvariadic-macros,
-Wold-style-definition, -Winit-self, -Wvariadic-macros, -Wmissing-include-dirs,
-Winit-self, -Wc++-compat)

Solution:
Added a pre-condition to detect pathScale compiler before Gcc is
accepted.

Tested:
Sandia Glory where PathScale compiler is available.

config/gnu-flags

@@ -26,8 +26,10 @@
 #   cc_version:   Version number: 2.91.60, 2.7.2.1
 #
 if test X = "X$cc_flags_set"; then
-    cc_version="`$CC $CFLAGS $H5_CFLAGS -v 2>&1 |grep 'gcc version' |\
-	        sed 's/.*gcc version \([-a-z0-9\.]*\).*/\1/'`"
+    # PathScale compiler spits out gcc version string too. Need to
+    # filter it out.
+    cc_version="`$CC $CFLAGS $H5_CFLAGS -v 2>&1 | grep -v 'PathScale' |\
+	grep 'gcc version' | sed 's/.*gcc version \([-a-z0-9\.]*\).*/\1/'`"
     cc_vendor=`echo $cc_version |sed 's/\([a-z]*\).*/\1/'`
     cc_version=`echo $cc_version |sed 's/[-a-z]//g'`
     if test X = "X$cc_vendor" -a X != "X$cc_version"; then