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ape/make: fix \ line continuation parsing

--- a/sys/src/ape/cmd/make/gram.y

+++ b/sys/src/ape/cmd/make/gram.y

@@ -321,17 +321,17 @@

 				break;

 			case '\n':

-				++yylineno;

-				if(p==yytext || p[-1]!='\\')

-					{

-					*p = '\0';

-					goto endloop;

-					}

-				p[-1] = ' ';

-				while( (kc=getc(fin))=='\t' || kc==' ' || kc=='\n')

-					if(kc == '\n')

-						++yylineno;

-	

+				do {

+					++yylineno;

+					if(p==yytext || p[-1]!='\\')

+						{

+						*p = '\0';

+						goto endloop;

+						}

+					p[-1] = ' ';

+					while( (kc=getc(fin))=='\t' || kc==' ')

+						;

+				} while(kc == '\n');

 				if(kc != EOF)

 					break;

 			case EOF: