Build system bugs related to handling of 'LIBS' environment variable

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Hello,

Git fails to build if LIBS contains -lpthread.  To reproduce:

  export LIBS=-lpthread
  ./configure
  make V=1 git-credential-store

The bug is that linker command line does not contain -lpthread, so
linking fails.

configure respects LIBS and finds that it does not have to add
anything for pthread:

checking for POSIX Threads with ''... yes

But (first bug) configure does not pass the LIBS variable in
config.mak.autogen.  Even if it did, Makefile would overwrite (second
bug) LIBS with:

  LIBS = $(GITLIBS) $(EXTLIBS)

Makefile should rather append to LIBS.

Dmitri Gribenko

--
main(i,j){for(i=2;;i++){for(j=2;j<i;j++){if(!(i%j)){j=0;break;}}if
(j){printf("%d\n",i);}}} /*Dmitri Gribenko <gribozavr@xxxxxxxxx>*/
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