archivers/7-zip: fix build on big-endian

Checking for _LITTLE_ENDIAN causes:
../../Archive/../Compress/../../../C/CpuArch.h:280:4: error: Stop_Compiling_Bad_Endian
  280 |   #error Stop_Compiling_Bad_Endian
      |    ^

This is because sys/_endian.h defines _LITTLE_ENDIAN.

archivers/7-zip/Makefile

@@ -30,6 +30,7 @@ CFLAGS_aarch64?=	-march=armv8-a+crc+crypto
 NO_WRKSUBDIR=	yes
 BUILD_WRKSRC=	${WRKSRC}/CPP/7zip/Bundles/Alone2
 DOS2UNIX_FILES=	C/CpuArch.c \
+		C/CpuArch.h \
 		C/7zCrc.c \
 		C/Aes.c \
 		C/AesOpt.c \

archivers/7-zip/files/patch-C_CpuArch.h

@@ -0,0 +1,10 @@
+--- C/CpuArch.h.orig	2024-12-18 16:06:28 UTC
++++ C/CpuArch.h
+@@ -247,7 +247,6 @@ MY_CPU_64BIT means that processor can work with 64-bit
+     || defined(MY_CPU_ARM_LE) \
+     || defined(MY_CPU_ARM64_LE) \
+     || defined(MY_CPU_IA64_LE) \
+-    || defined(_LITTLE_ENDIAN) \
+     || defined(__LITTLE_ENDIAN__) \
+     || defined(__ARMEL__) \
+     || defined(__THUMBEL__) \