OvmfPkg/build.sh: Detect GCC 4.5 & 4.6

Detect GCC 4.5 & 4.6, and use GCC45 and GCC46 toolchains.

Signed-off-by: jljusten

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12614 6f19259b-4bc3-4df7-8a09-765794883524
MU SOURCE COMMIT:8567a8ca77ef17c40af376da472a3b7224ce8756

Platforms/OvmfPkg/build.sh

@@ -67,8 +67,19 @@ case `uname` in
       fi
       ;;
   Linux*)
-    TARGET_TOOLS=GCC44
-    ;;
+    gcc_version=$(gcc -v 2>&1 | tail -1 | awk '{print $3}')
+    case $gcc_version in
+      4.5.*)
+        TARGET_TOOLS=GCC45
+        ;;
+      4.6.*)
+        TARGET_TOOLS=GCC46
+        ;;
+      *)
+        TARGET_TOOLS=GCC44
+        exit 1
+        ;;
+    esac
 esac
 
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