audio/spectmorph: Remove 'register' keywords instead of having USE_ST…

…DCXX=c++17

Reported by:	fallout

audio/spectmorph/Makefile

@@ -25,7 +25,6 @@ USE_GNOME=	cairo glib20
 USE_GL=		gl
 USE_XORG=	x11
 USE_LDCONFIG=	yes
-USE_CXXSTD=	c++14 # fix compilation failure on 14: error: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
 
 SHEBANG_FILES=	tools/sminstbuilder.in
 

audio/spectmorph/files/patch-lib_smmath.hh

@@ -0,0 +1,23 @@
+- fix compilation failure on 14: error: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
+- see https://github.com/swesterfeld/spectmorph/issues/23
+
+--- lib/smmath.hh.orig	2023-07-12 03:47:47 UTC
++++ lib/smmath.hh
+@@ -431,7 +431,7 @@ double db_from_factor (double factor, double min_dB);
+
+ #if defined (__i386__) && defined (__GNUC__)
+ static inline int G_GNUC_CONST
+-sm_ftoi (register float f)
++sm_ftoi (float f)
+ {
+   int r;
+
+@@ -441,7 +441,7 @@ sm_ftoi (register float f)
+   return r;
+ }
+ static inline int G_GNUC_CONST
+-sm_dtoi (register double f)
++sm_dtoi (double f)
+ {
+   int r;
+