Fix issue with VP8 compilation on raspberry pi

builders/vpx.cmake

@@ -145,6 +145,7 @@ else()
 		)
 		list(REMOVE_ITEM EP_vpx_CONFIGURE_OPTIONS "--enable-multithread")
 	else()
+		lcb_use_c_compiler_for_assembler(NO)
 		if(CMAKE_SYSTEM_PROCESSOR STREQUAL "armv7l")
 			set(VPX_TARGET "armv7-linux-gcc")
 		else()

cmake/Autotools/Autotools.cmake.in

@@ -22,6 +22,10 @@
 
 if("@CMAKE_C_COMPILER_ID@" STREQUAL "GNU")
 	string(REGEX REPLACE "gcc$" "as" AS_COMPILER "@CMAKE_C_COMPILER@")
+	if (AS_COMPILER STREQUAL "@CMAKE_C_COMPILER@")
+		#fallback for the case where gcc is found as /usr/bin/cc
+		string(REGEX REPLACE "cc$" "as" AS_COMPILER "@CMAKE_C_COMPILER@")
+	endif()
 	set(AUTOTOOLS_AS_COMPILER ${AS_COMPILER} CACHE PATH "Initial cache" FORCE)
 endif()
 set(C_LAUNCHER "")