MIPS: Fix mipsel GYP build on Emdebian.

Emdebian's cross compiler identifies itself as
"Target: mipsel-linux-gnu"; modified pattern to
match this compiler too.

BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/10810006
Patch from Akos Palfi <palfia@homejinni.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@12142 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

build/common.gypi

@@ -164,7 +164,7 @@
           'V8_TARGET_ARCH_MIPS',
         ],
         'variables': {
-          'mipscompiler': '<!($(echo ${CXX:-$(which g++)}) -v 2>&1 | grep -q "^Target: mips-" && echo "yes" || echo "no")',
+          'mipscompiler': '<!($(echo ${CXX:-$(which g++)}) -v 2>&1 | grep -q "^Target: mips" && echo "yes" || echo "no")',
         },
         'conditions': [
           ['mipscompiler=="yes"', {