[PATCH] Patch to fix libecpg.so for isinf missing

hi

isinf() is not build to libecpg.so if build and install postgresql by 
source on solaris9.
(isinf() is not contained within solaris9 system.)

bash-2.05$ nm /usr/local/pgsql/lib/libecpg.so | grep isinf
[215]   |         0|       0|FUNC |GLOB |0    |UNDEF  |isinf

It(isinf missing) will causes ecpg program compile error such as follows.

bash-2.05$ ecpg test.pgc
bash-2.05$ cc -I/usr/local/pgsql/include -L/usr/local/pgsql/lib -lecpg 
test.c -o test
Undefined                       first referenced
  symbol                             in file
isinf                               /usr/local/pgsql/lib/libecpg.so
ld: fatal: Symbol referencing errors. No output written to test


I modify src/interfaces/ecpg/ecpglib/Makefile to resolve this problem.
The diff file refer to the attachment "ecpglib-Makefile.patch".

Regards,
Jiang Guiqing