math/symfpu: fix build on non-x86

Only supply x86-specific CXXFLAGS on i386 and amd64.

Approved by:	portmgr (build fix blanket)

math/symfpu/Makefile

@@ -15,12 +15,15 @@ USE_GITHUB=	yes
 GH_ACCOUNT=	martin-cs
 GH_TAGNAME=	c3acaf6
 
-CXXFLAGS+=	-I${WRKSRC}
-
 ALL_TARGET=	subdirs symfpu.a
-
 MAKE_ARGS=	SUBDIRS=baseTypes
 
+# these flags are x86-only and have been patched out
+# of ${WRKSRC}/flags for portability
+CXXFLAGS_amd64=	-msse -mfma -mno-fma4 -mfpmath=sse
+CXXFLAGS_i386=	${CXXFLAGS_amd64}
+CXXFLAGS+=	${CXXFLAGS_${ARCH}} -I${WRKSRC}
+
 do-install:
 	${MKDIR} \
 		${STAGEDIR}${PREFIX}/include/symfpu/core \

math/symfpu/files/patch-flags

@@ -0,0 +1,5 @@
+--- flags.orig	2023-04-17 21:44:48 UTC
++++ flags
+@@ -1 +1 @@
+-CXXFLAGS+=-std=gnu++11 -Wall -W -frounding-math -fsignaling-nans -ffp-contract=off -msse2 -mfpmath=sse -pedantic -mfma -mno-fma4
++CXXFLAGS+=-std=gnu++11 -Wall -W -frounding-math -fsignaling-nans -ffp-contract=off -pedantic