* nt/configure.bat: Renamed the fusercflags variable to escusercflags
so that the variable name better matches its purpose, to be identical to usercflags with the exception that all quotes are escaped by the \ character. Renamed the fuserldflags variable to escuserldflags so that the variable name better matches its purpose, to be identical to userldflags with the exception that all quotes are escaped by the \ character. A new ESC_USER_CFLAGS variable is written to config.settings. This variable has the same value as the escusercflags variable. * nt/gmake.defs, nt/nmake.defs: Added the variable ESC_CFLAGS. This variable is identical to the CFLAGS variable except that it includes the new ESC_USER_CFLAGS variable instead of USER_CFLAGS. * src/makefile.w32-in: The bootstrap-temacs rule now makes use of one of two shell specific rules, either bootstrap-temacs-CMD or bootstrap-temacs-SH. The bootstrap-temacs-SH rule is identical to the previous implementation of the bootstrap-temacs rule. The bootstrap-temacs-CMD rule is similar to the previous implementation of the bootstrap-temacs rule except that it makes use of the ESC_CFLAGS variable instead of the CFLAGS variable. These changes are required to extend my earlier fix to add support for --cflags and --ldflags options that include quotes so that it works whether make uses cmd or sh as the shell.
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