Fix a few things in Makefile guidelines - bitreich-style - Style guide for programmers.
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       ---
 (DIR) commit f428b125ec23c9c03c88380e2ecde62c04a943bf
 (DIR) parent 9753b870ed2a7e43799d1207e7a91d5828ebdb19
 (HTM) Author: Quentin Rameau <quinq@fifth.space>
       Date:   Tue, 13 Jul 2021 23:40:15 +0200
       
       Fix a few things in Makefile guidelines
       
       - internal macros are only allowed in target command lines
       - there's no need to specify -o with -c as the default is to use the
         same name as the source
       
       Signed-off-by: Christoph Lohmann <20h@r-36.net>
       
       Diffstat:
         M c/makefile-guideline.txt            |       6 +++---
       
       1 file changed, 3 insertions(+), 3 deletions(-)
       ---
 (DIR) diff --git a/c/makefile-guideline.txt b/c/makefile-guideline.txt
       @@ -176,10 +176,10 @@ Build the json.c file as a local reusable linkable library (libjson.a).
        
        The default build rule: build the binary.
        
       -    29        ${BIN}: ${LIB} ${@:=.o}
       +    29        ${BIN}: ${LIB} ${BIN:=.o}
            30        
        
       -The binary depends on the own libjson library and object files.
       +The binary depends on the libjson library and its own object file.
        
            31        OBJ = ${SRC:.c=.o} ${LIBJSONOBJ}
            32        
       @@ -199,7 +199,7 @@ Linking, use the system specified LDFLAGS.
        
            37        
            38        .c.o:
       -    39                ${CC} ${CFLAGS} ${CPPFLAGS} -o $@ -c $<
       +    39                ${CC} ${CFLAGS} ${CPPFLAGS} -c $<
        
        Compiling, use the system specified CFLAGS and CPPFLAGS.