Fixed inline initialization of non-integral static const member

Such initializations are a GNU extension not supported by clang.

Change-Id: I543c35cacdda080d2599cb99587661b2e9cd404f
Author: Ariel Bernal <ariel.j.bernal@intel.com>
Reviewed-by: Kevin P Schoedel <kevin.p.schoedel@intel.com>
diff --git a/native/jni/src/proximity_info.h b/native/jni/src/proximity_info.h
index feb0c94..d4d8f44 100644
--- a/native/jni/src/proximity_info.h
+++ b/native/jni/src/proximity_info.h
@@ -77,7 +77,7 @@
     static const int MAX_KEY_COUNT_IN_A_KEYBOARD = 64;
     // The upper limit of the char code in mCodeToKeyIndex
     static const int MAX_CHAR_CODE = 127;
-    static const float NOT_A_DISTANCE_FLOAT = -1.0f;
+    static const float NOT_A_DISTANCE_FLOAT;
     static const int NOT_A_CODE = -1;
 
     int getStartIndexFromCoordinates(const int x, const int y) const;