Declare/define static functions via BLIS_INLINE.

Details:
- Updated all static function definitions to use the cpp macro
  BLIS_INLINE instead of the static keyword. This allows blis.h to
  use a different keyword (inline) to define these functions when
  compiling with C++, which might otherwise trigger "defined but
  not used" warning messages. Thanks to Giorgos Margaritis for
  reporting this issue and Devin Matthews for suggesting the fix.
- Updated the following files, which are used by configure's
  hardware auto-detection facility, to unconditionally #define
  BLIS_INLINE to the static keyword (since we know BLIS will be
  compiled with C, not C++):
    build/detect/config/config_detect.c
    frame/base/bli_arch.c
    frame/base/bli_cpuid.c
- CREDITS file update.

frame/thread/bli_thread.h

@@ -196,7 +196,7 @@ void  bli_thread_init_rntm_from_env( rntm_t* rntm );
 
 // -----------------------------------------------------------------------------
 
-static void bli_thread_range_jrir_rr
+BLIS_INLINE void bli_thread_range_jrir_rr
      (
        thrinfo_t* thread,
        dim_t      n,
@@ -213,7 +213,7 @@ static void bli_thread_range_jrir_rr
 	*end   = n;
 }
 
-static void bli_thread_range_jrir_sl
+BLIS_INLINE void bli_thread_range_jrir_sl
      (
        thrinfo_t* thread,
        dim_t      n,
@@ -229,7 +229,7 @@ static void bli_thread_range_jrir_sl
 	*inc = 1;
 }
 
-static void bli_thread_range_jrir
+BLIS_INLINE void bli_thread_range_jrir
      (
        thrinfo_t* thread,
        dim_t      n,
@@ -251,7 +251,7 @@ static void bli_thread_range_jrir
 }
 
 #if 0
-static void bli_thread_range_weighted_jrir
+BLIS_INLINE void bli_thread_range_weighted_jrir
      (
        thrinfo_t* thread,
        doff_t     diagoff,