Include strings.h for the strcasecmp prototype.

Change-Id: I83cd464d59d16f1c5f8afa7e50d474ca2bb41713
diff --git a/drm/common/DrmSupportInfo.cpp b/drm/common/DrmSupportInfo.cpp
index c0bff0e..3dee435 100644
--- a/drm/common/DrmSupportInfo.cpp
+++ b/drm/common/DrmSupportInfo.cpp
@@ -15,6 +15,7 @@
  */
 
 #include <drm/DrmSupportInfo.h>
+#include <strings.h>
 
 using namespace android;
 
@@ -152,4 +153,3 @@
     mIndex++;
     return value;
 }
-