Incremental build failure with CMake + Ninja

[TT-billteng]

@pgkeller has seen incremental build when he touches a cq_commands.h

+++ b/tt_metal/impl/dispatch/cq_commands.hpp
@@ -138,8 +138,12 @@ struct CQDispatchWritePagedCmd {
     uint32_t pages;
 } __attribute__((packed));

+
+constexpr uint32_t CQ_DISPATCH_CMD_PACKED_WRITE_FLAG_NONE      = 0x00;
+constexpr uint32_t CQ_DISPATCH_CMD_PACKED_WRITE_FLAG_MCAST     = 0x01;
+constexpr uint32_t CQ_DISPATCH_CMD_PACKED_WRITE_FLAG_NO_STRIDE = 0x02;
 struct CQDispatchWritePackedCmd {
-    uint8_t is_multicast;
+    uint8_t flags;            // see above
     uint16_t count;           // number of sub-cmds (max 1020 unicast, 510 mcast). Max num sub-cmds = (dispatch_constants::TRANSFER_PAGE_SIZE - sizeof(CQDispatchCmd)) / sizeof(CQDispatchWritePacked*castSubCmd)
     uint32_t addr;            // common memory address across all packed SubCmds
     uint16_t size;            // size of each packet, stride is padded to L1 alignment and less than dispatch_cb_page_size

[tt-aho]

I've had quite a few build failures as well with incremental build when I touch the lower level metal/runtime files, and I have to blow away the build folder to resolve. Didn't keep track of anything specific, but can track/update in the future.