Building for qemuarm without thumb enabled is using -march=armv5e which isn't
recognized here. Fix it by adding __ARM_ARCH_5E__.

v0.12.2 branch of node doesn't seem to be affected, because it's using
different version of v8

Upstream-Status: Pending

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

diff -uNr node-v0.12.2/deps/v8/src/base/atomicops_internals_arm_gcc.h node-v0.12.2-fix/deps/v8/src/base/atomicops_internals_arm_gcc.h
--- node-v0.12.2/deps/v8/src/base/atomicops_internals_arm_gcc.h	2015-04-01 00:13:01.000000000 +0200
+++ node-v0.12.2-fix/deps/v8/src/base/atomicops_internals_arm_gcc.h	2015-04-28 14:30:43.119509207 +0200
@@ -156,7 +156,7 @@
 
 // This tests against any known ARMv5 variant.
 #elif defined(__ARM_ARCH_5__) || defined(__ARM_ARCH_5T__) || \
-      defined(__ARM_ARCH_5TE__) || defined(__ARM_ARCH_5TEJ__)
+      defined(__ARM_ARCH_5E__) || defined(__ARM_ARCH_5TE__) || defined(__ARM_ARCH_5TEJ__)
 
 // The kernel also provides a helper function to perform an atomic
 // compare-and-swap operation at the hard-wired address 0xffff0fc0.