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>

native/jni/src/proximity_info.cpp

@@ -35,6 +35,8 @@ inline void copyOrFillZero(void *to, const void *from, size_t size) {
     }
 }
 
+const float ProximityInfo::NOT_A_DISTANCE_FLOAT = -1.0f;
+
 ProximityInfo::ProximityInfo(const std::string localeStr, const int maxProximityCharsSize,
         const int keyboardWidth, const int keyboardHeight, const int gridWidth,
         const int gridHeight, const int mostCommonKeyWidth,

native/jni/src/proximity_info.h

@@ -77,7 +77,7 @@ class ProximityInfo {
     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;