Fix Android cross-compilation failing with unsupported '-mavx' flag

The Linux AVX auto-detection checked the host's /proc/cpuinfo, which
passes on x86 CI runners even when cross-compiling for Android ARM
targets. Skip AVX detection when CC contains 'android'.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: asg017

Makefile

@@ -43,10 +43,12 @@ ifndef OMIT_SIMD
 	CFLAGS += -mcpu=apple-m1 -DSQLITE_VEC_ENABLE_NEON
 	endif
 	ifeq ($(shell uname -s),Linux)
+	ifeq ($(findstring android,$(CC)),)
 	ifneq ($(filter avx,$(shell grep -o 'avx[^ ]*' /proc/cpuinfo 2>/dev/null | head -1)),)
 	CFLAGS += -mavx -DSQLITE_VEC_ENABLE_AVX
 	endif
 	endif
+	endif
 endif
 
 ifdef USE_BREW_SQLITE