Fix libgcc broken lib path

Summary: current libgcc lib path is broken, update it and make sure the new one exists

Test Plan:
verify that the new path exists
make check -j64

Reviewers: yiwu, sdong, andrewkr

Reviewed By: andrewkr

Subscribers: andrewkr, dhruba

Differential Revision: https://reviews.facebook.net/D59535

build_tools/fbcode_config.sh

@@ -14,7 +14,7 @@ CFLAGS=""
 
 # libgcc
 LIBGCC_INCLUDE="$LIBGCC_BASE/include"
-LIBGCC_LIBS=" -L $LIBGCC_BASE/libs"
+LIBGCC_LIBS=" -L $LIBGCC_BASE/lib"
 
 # glibc
 GLIBC_INCLUDE="$GLIBC_BASE/include"

build_tools/fbcode_config4.8.1.sh

@@ -9,7 +9,7 @@ source "$BASEDIR/dependencies_4.8.1.sh"
 
 # location of libgcc
 LIBGCC_INCLUDE="$LIBGCC_BASE/include"
-LIBGCC_LIBS=" -L $LIBGCC_BASE/libs"
+LIBGCC_LIBS=" -L $LIBGCC_BASE/lib"
 
 # location of glibc
 GLIBC_INCLUDE="$GLIBC_BASE/include"