Switch to GCC 4.7 for X86 and MIPS

Change-Id: I1c2021a15f53e064baf69084894c114289ef7c54
diff --git a/core/combo/TARGET_linux-mips.mk b/core/combo/TARGET_linux-mips.mk
index c549af9..6a29564 100644
--- a/core/combo/TARGET_linux-mips.mk
+++ b/core/combo/TARGET_linux-mips.mk
@@ -35,7 +35,7 @@
 endif
 
 ifeq ($(strip $(TARGET_GCC_VERSION_EXP)),)
-TARGET_GCC_VERSION := 4.6
+TARGET_GCC_VERSION := 4.7
 else
 TARGET_GCC_VERSION := $(TARGET_GCC_VERSION_EXP)
 endif
diff --git a/core/combo/TARGET_linux-x86.mk b/core/combo/TARGET_linux-x86.mk
index 01b5d02..9424f81 100644
--- a/core/combo/TARGET_linux-x86.mk
+++ b/core/combo/TARGET_linux-x86.mk
@@ -23,7 +23,7 @@
 endif
 
 ifeq ($(strip $(TARGET_GCC_VERSION_EXP)),)
-TARGET_GCC_VERSION := 4.6
+TARGET_GCC_VERSION := 4.7
 else
 TARGET_GCC_VERSION := $(TARGET_GCC_VERSION_EXP)
 endif