v3.8 - add hdr_v3 boot/vendor_boot support, improve lz4 support, fixes

- fix magic detection false positives of OSIP bootimg headerless
- add test to ensure Windows sudo is executable
- fix multiple Windows sudo prompts by putting ramdisk packing commands into a single find2cpio.bat to execute
- fix for corrected unpackbootimg/unpackelf kernel+ramdisk suffixes
- update AOSP support for boot_img_hdr_v3
- add AOSP vendor_boot VNDRBOOT magic detection and support
- fix false no files error on ramdisks with only directories in root
- fix lz4 and lz4-l ramdisk default repack compression level to match what Google seems to be using
- update slimmed magic file (from file 5.40) with my own fixes
- fix exiting scripts with an error code on failures

Author: osm0sis

android_win_tools/androidbootimg.magic

@@ -40,11 +40,18 @@
 >>2048	search		\x88\x16\x88\x58	\b, MTK headers
 !:strength * 3
 
+# Google Pixel/AOSP Vendor Standard
+# [test "x" as workaround to odd file/magic behavior not allowing search here]
+0		string		x
+>0		search		VNDRBOOT			AOSP_VNDR bootimg
+!:strength * 3
+
 # DENX U-Boot
 0		string		\x27\x05\x19\x56	U-Boot bootimg
 
 # Intel OSIP
 1000	search		\xFC\xFA\xBC\x00	OSIP bootimg (headerless)
+!:strength / 15
 0		string		$OS$\x00\x00\x01	OSIP bootimg
 >52		string		\x00\x00\x00\x00	\b, boot (signed)
 >52		string		\x01\x00\x00\x00	\b, boot (unsigned)

android_win_tools/find2cpio.bat

@@ -0,0 +1 @@
+"%bin%"\find . | "%bin%"\cpio -H newc -R 0:0 -o -F ..\ramdisk-new.cpio 2>nul